Basic Research Journal of Agricultural Science and Review ISSN 2315-6880 Vol. 4(10) pp. 296-303 October 2015 Available online http//www.basicresearchjournals.org Copyright ©2015 Basic Research Journal Review Tillage and nutrient management in wheat with different plant geometries under rice- wheat cropping system: A Review Aniket Kalhapure1*, Vijay Pal Singh2, Rajeew Kumar3 and D.S. Pandey2 Department of Agronomy, Gobind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand (India) 2 3 Professor of Agronomy, Assistant Professor of Agronomy *Corresponding author Email: [email protected] Accepted 22 October, 2015 ABSTRACT Maintaining the food security of about 127 crore populations is the hard challenge for Indian agriculture where 10 million hectare land is occupied by rice- wheat cropping system. In most of the rice cultivating region the climatic, resource input and management factors forces to adopt the lowland raising of paddy with puddling, which is describes as the boon for paddy; but curse for succeeding upland wheat crop because of disturbed soil physico- chemical and biological properties. Tillage and nutrient management may become as the solution for maintaining the productivity of both the crops with sustainability. Keywords: Rice- wheat cropping system, tillage, nutrient management, row spacing, soil properties, wheat growth and yield INTRODUCTION Rice- wheat is the important predominant cropping system in South Asia, which majorly includes countries like India, Pakistan and Bangladesh. Both are the staple food grain crops of this region and the system occupies about 13.5 million ha area of the region including 10 million hectares in India and 33% agricultural population depends upon it (Tripathi et al., 2015). Puddling (wet tillage) is the most common technique of land preparation for maximizing yield of rice in Asian countries (Fujihara et al., 2013). Pudlling creates a plough layer that reduces hydraulic conductivity to support water ponding, which minimize the water percolation losses and enhance the water and nutrient use efficiency in rice (Mousavi et al., 2009). Puddling breaks down large soil aggregates, destroys non capillary pores, reduces apparent specific volume, and increases microvoids (Ghildyal, 1978). A puddled soil retains more water than an unpuddled soil at similar soil moisture tension. Because puddling reduces noncapillary porosity and increases bulk density, hydraulic conductivity and percolation substantially decline. Evaporation and drainage from puddled soil is markedly less than from the same soil in an aggregated state (De Datta et al., 1974). But previous study of long term cropping experiments in Asia has reported the yield stagnation or even declination of rice- wheat cropping system (Ladha et al., 2003). The degradation of soil quality is a key factor for the observed declining yield (Ladha et al., 2003a). Puddled soil is unfavorable for upland crops following rice because when puddled soil dries, bulk density increases, infiltration rate decreases, Published by Basic Research journal of Agricultural Science and Review Aniket et al. 297 aeration declines, and soil impedance to root growth rises (Scheltema, 1974). Rice and wheat in sequence are cultivated in two contrasting soil environments- rice requires soft, puddled and water saturated soil conditions, while wheat requires well aggregated and well aerated soil with fine tilth (Kumar et al.., 2012). Puddling creates soil conditions ideal for rice cultivation, but unsuitable for upland crops which follow rice (Sharma and Datta, 1986; Sharma et al., 2003). After rice harvest, puddled soils, upon drying shrink, become compact and hard, and develop surface cracks of varying sizes and shapes (Kumar et al.., 2012). The draft power requirement for tilling such soils is very high, sometimes beyond the reach of local ploughs and small tractors. Nevertheless, when tilled, these soils often break into larger clods, having high breaking energy (Sharma and Bhagat, 1993). In spite of spending significant time and energy, it is often difficult to obtain seedbeds with the desired tilth for sowing wheat. Wheat planted in seedbeds with coarse tilth, due mainly to poor seed-soil contact, results in poor seedling emergence and unsatisfactory crop stands. This lowers wheat productivity (Kumar et al., 2012). Effect of lowland rice cultivation on succeeding wheat crop and soil properties Disturbed soil structure, lowered infiltration rate, decreased soil porosity and formation of hard pan are the major effects of lowland rice cultivation. Talpur et al. (2013) reported that a layer is formed below 30 cm depth due to successive shallow ploughing in lowland rice, which create hindrance for the root growth of succeeding crop. Dhiman et al. (1998) reported that bulk density was increased under transplanted rice. Soil compaction of agricultural land is a global problem and is an important form of physical land degradation (Soane and Van Ouwerkerk, 1994). The recent increase in the mechanization of agriculture and intensive agriculture, especially in lowland rice are the main causes of soil compaction which leads to the formation of hard pan. In addition, reduced use of organic matter, frequent use of chemical fertilizers and ploughing at the same depth for many years make the soil compact. Compaction causes unfavorable changes in soil bulk density, porosity and penetration resistance (Soane et al., 1981). Adverse effects of compacted soil horizons on plant root growth and concomitant poor plant growth and yields have been recognized for many years (Jorajuria et al., 1997). Excessive soil compaction impedes root growth and plants, thus cannot explore the entire soil volume to meet their demand of soil moisture and plant nutrients because these become positionally unavailable. This can decrease the plant’s ability to take up nutrients and water. Limited water and nutrient availability to plants due to compaction are major constraints to plant growth and yields in many soils. Compaction can result in low water use efficiency (Ishaq et al., 2000), greater losses of plant available water and less use of fertilizer (Stepniewski and Przywara, 1992). Soil compaction affects soil storage and supply of nutrients by increasing soil bulk density, decreasing porosity, soil water infiltration and water holding capacity. These effects reduce fertilizer efficiency and yield, increasing water logging, runoff and soil erosion with the undesirable environmental problems (Assouline, 2002). Wheat crop grown after lowland rice results into the decrease in yield by lower root and shoot growth when it is grown as succeeding crop after lowland rice (Hobbs and Giri, 1998). Effect of tillage on Soil properties in wheat under rice- wheat cropping system (RWCS) Soil tillage is among the important factors affecting soil properties and crop yield and it contributes up to 20% (Khurshid et al., 2006). Deep tillage is one of the most important factors to overcome the problem of formation of hard pan into the soil (Sharma and Behera, 2008). In soils with plow pans or where shallow hardpans occur, deep plowing and subsoiling may increase soil water storage and promote root penetration (Hundal and Tomar, 1985). It can be broken by chisel phoughing or other deep ploughing implements viz. subsoiler (Singh et al., 2015). Deep tillage is a practice that breaks up soil, usually 1218 inches deep, to allow increased water movement, decrease in bulk density, better aeration of the roots, lower soil penetration resistance and access to additional minerals and nutrients for plant growth (Ji et al., 2013). By comparison, conventional tillage breaks up the soil 6-8 inches below the surface, and in areas of heavy compaction, such a practice is not adequate for raising of wheat crop after puddle rice (Usman et al., 2013). Deep tillage is normally a very aggressive tillage operation, designed to break up the soil and mix the residue in with the soil (Singh et al., 2015). Main concern for deep tillage is to reduce the soil compaction caused by vehicular traffic, to break the hard pan, to decrease the soil bulk density and soil strength for deeper rooting of crops, to explore the entire soil volume for water and nutrients, to increase the infiltration rate and to decrease the soil temperature (Ji et al., 2013). Deep tillage also improves soil moisture content (Sharma ans Behera, 2008). Deep tillage practices like plowing with chisel plow or moldboard plow performed better than shallow tillage practices viz. rotary tillage or cultivator, as deep tillage improved soil moisture content, bulk density and penetration resistance in silty clay loam soil under irrigated wheat crop, and hence such deep tillage practices Published by Basic Research journal of Agricultural Science and Review 298. Basic Res. J. Agric. Res. Rev. Table1. Effect of tillage depth on post experimental soil bulk density, particle density and porosity in wheat (Alam and Salahin, 2013) Tillage depth 0-4cm 10-12cm 20-25cm CV (%) SE± 3 Bulk density (g/cm ) 1.49 1.48 1.46 2.95 0.008 3 Particle density (g/cm ) 2.58 2.57 2.55 2.43 0.004 Porosity (%) 42.25 42.41 42.75 3.61 0.403 are recommended for silty clay loam soil in semiarid environment for better crop production (Muhammad et al., 2014); Bhusan et al. (1973) have also reported that deep tillage results into more stirring (loosening and mixing) of soil decreasing the large size aggregates (2 to 5 mm), but improved the granulation of smaller aggregates (1 to 0.1 mm) and thereby increased the total pore spacing of the soil, and consequently decreased the bulk density in both surface and sub soil layers, as a consequence of enhanced and proliferated root growth. Tillage increases the basic infiltration rate of soil which could be caused by a different structure pattern with a different pore system being created by them due to the influence of plough pan (Pelegrin et al.. 1990). An improvement in basic infiltration rate and hydraulic conductivity of the soil due to chisel tillage is attributed to a significant change in the soil pore geometry and enhanced root growth in the surface soil layer. The soil moisture content observed was high with Chisel Plough and combination of chisel plough followed by rotary tillage (Boydas and Turgut, 2007); Boydas (2007) also reported that the rotary harrow significantly increased the soil roughness. The lowest bulk density was observed with Chisel ploughing at a depth of 0-10 cm than rotary tillage (Ozpinar and Cay, 2006). Soil organic C and N contents were higher under chisel than moldboard plough treatment, which might be due to accumulation of crop residues at soil surface, thereby reducing their contact with soil microorganisms and their decomposition and soil pH of the wheat field was significantly increased under chisel treatment, residues incorporation and application of 150 kg N/ha (Alijani et al..2012). The higher soil pH values of chisel treatment and residues incorporated system could be attributed to higher contents of soil organic matter in conservation practices (Abdollahi, 2010; Fuentes et al.., 2009). Deep tillage operation may be needed to disrupt the developing zone of relatively compacted soil below the plow layer under conventional tillage (Motschenbacher et al., 2011). Table 1. by ultimately increases the yield (Mohanty et al., 2007). Deep tillage can increase root depth (Lampurlanes et al., 2001; Rajkannan and Selvi, 2002), improve infiltration and water storage (Sharma et al., 2004), and ultimately increase crop yield. Deep tillage break up high density soil layers, improves water infiltration and movement in the soil, enhances root growth and development, and increases crop production (Bennie and Botha, 1986). In soils that are prone to compaction and experience crusting and have low water infiltration capacity, deep tillage can increase root depth (Lampurlanes et al., 2001), improve infiltration and water storage (Sharma et al., 2004) and ultimately increase crop yield. Khan et al., (2013) reported that deep tillage with chisel plough significantly produced higher fertile tillers than conventional tillage. Maximum number of grains per spike was noted in deep tilled wheat that was 5, 20 and 22 percent significantly higher than conventional tillage, zone disc tiller and happy seeder, respectively. Wheat biological yield was also significantly higher in deep tillage as compared to other tillage treatments. Deep tillage also produced significantly higher grain yield. Maximum water use efficiency was noted in deep tillage and zone disc tiller. Significantly higher fertile tillers were noted in deep tillage as compared to other tillage systems. Deep tillage made fine and deep seedbed, which enhanced the rooting depth and water storage that was helpful for crop germination and establishment as argued by Ozpinar and Cay (2006). Deep tillage with chisel plough produced higher number of grains per spike in barley in rice barley cropping system (Sip et al., 2009). Higher grain yield in deep tillage may have been due to finer, loose and deep soil structure, which positively influenced the seedling emergence to endorse higher crop yields (Rashidi and Keshavarzpour, 2007); Tripathi and Singh (2007) reported the increase in rice and wheat yields with chiseling over non-chiselling. Grain yield of wheat was higher in chisel than moldboard plough and rotary tillage (Alijani et al., 2012). Effect of tillage on wheat growth and yield in RWCS Effect of nutrient management on soil properties Tillage improves the physical conditions of the soil there Nutrient management is another important concept which Published by Basic Research journal of Agricultural Science and Review Aniket et al. 299 Table 2. Effect of different nutrient management options in wheat on grain yield and nutrient uptake (Brar et al., 2015) Treatment 50% NPK 150% NPK 100% NPK 100% NPK+ Zn 100% NPK+ FYM Control Wheat yield (t/ha) Grain Straw 3.53e 5.34c 5.08ab 8.43a 4.69bc 8.25a 4.65c 7.59ab 5.13a 8.48a 1.63f 2.61d Nutrient uptake (kg/ha) N P K 83.8f 9.4d 53.9d 130.1b 18.3a 81.8ab 122.8bc 16.3ab 82.0a 120.5c 17.3a 81.3ab 150.8a 18.5a 92.4a 40.1g 4.6e 25.9e (100% NPK= 150, 32.70 and 31.20 N, P and K per ha, respectively. FYM and Zinc sulfate applied @ 10 t and 50 kg per ha, respectively.) has great significance in sequential cropping of ricewheat (Usman et al., 2013). Use of chemical fertilizers and organic manures has been found promising in arresting the decline trend in soil-health and productivity through the correction of marginal deficiencies of some secondary and micro-nutrients, micro-flora and fauna and their beneficial influence on physical and biological properties of soil (Chondie, 2015). The integrated nutrient management has sustained the higher grain yields of rice and wheat over the years (Mehedi et al., 2011). The use of recommended dose of nutrients through chemical fertilizers, though sustained the crop yields, but does not improve the soil properties in respect of pH, soil organic carbon, cation exchange capacity and available N and K to the extent as improved by the combined use of the organics and inorganics, causing a serious threat to the soil health (Jaga and Upadyay, 2013). Use of organic sources of nutrients with chemical fertilizers can bring about equilibrium between degenerative and restorative activities in the soil eco-system (Upadhyay et al., 2011; Ram et al., 2014). Soil organic matter strongly affects soil properties such as water infiltration rate, erodibility, water holding capacity and nutrient cycling (Wander and Yang, 2000). It is suggested that proper management of soil organic matter is the heart of sustainable agriculture (Weil, 1992). Recent research has also recognized soil organic matter as a central indicator of soil health. Therefore, it is important to maintain proper levels of soil organic matter along with chemical fertilizers to sustain soil productivity. Application of 50% N through different organics (FYM, green manure or wheat cut straw) plus 50% NPK through chemical fertilizers were better over other treatments in respect of soil organic carbon, available N, P and K and bulk density of soil (Sepehya et al., 2012); Jaga and Upadyay (2013) reported the decreased bulk density and increased soil aeration with application of FYM in wheat crop. The soil physical and soil hydraulic properties (bulk density, soil moisture content, soil water retention, plant available water capacity and saturated hydraulic conductivity) got improved with the application of various organic manures and increasing chemical fertilizer levels from 50 to 150 % of recommended NPK in wheat- rice cropping sequence in N-W Himalayas (Choudhary et al., 2008). Application of FYM in rice wheat cropping system resulted in higher amount of available N, P and K in the soil after three years experimentation over control (Prasad and Mishra, 2001); Lal et al. (2014) has been reported the increased availability of N, P and K with application of FYM along with chemical fertilizers. The increase in soil N and P after FYM application might be due to the direct addition of N and P through decomposition of the FYM added to the soil. The improvement in the soil available P with FYM addition could be attributed to many factors, such as the addition of P through FYM, and retardation of soil P fixation by organic anions formed during FYM decomposition (Tadessel et al., 2013). Application of FYM significantly increased soil organic matter and available water holding capacity but decreased the soil bulk density. Compared to no FYM application, 7.5 and 15 t/ha FYM applications resulted in 3.6% and 10.3% increases in available water holding capacity, 17.8% and 46.6% increases in organic carbon, and 23.3% and 15.0% decreases in BD, respectively (Shirani et al., 2002). Application of 100% NPK along with 10t/ha FYM recorded improvement in various biological parameters of soil viz. soil microbial biomass carbon (SMBC), soil microbial biomass nitrogen (SMBN) and dehydrigenage activity (DHA) (Katkar et al., 2011). Table 2 above. Effect of nutrient management on growth and yield of wheat El-Gizawy (2009) reported that different rates of N, P and K fertilization has considerable effect on wheat and increased levels of these fertilizers increases all the growth and yield parameters of wheat crop (viz. plant hight, dry matter, number of effective tillers, spike length, 1000 seed weight and grain yield). Dixit and Gupta (2000); Selvakumari et al., (2000); Khoshgoftarmanesh and Kalbasi (2002) had also concluded that crop growth may be improved by the use of organic materials in the Published by Basic Research journal of Agricultural Science and Review 300. Basic Res. J. Agric. Res. Rev. Table3. Effect of row spacing on growth and yield of wheat (Iqbal et al., 2010) Row spacing (cm) 11.25 15.00 22.5 Germination 2 count/m 153.70a 151.28b 148.33b Fertile 2 tillers/m 263.37a 258.85b 252.85c form of organic manure or FYM. Ibrahim et al. (2008) have demonstrated the improvement of wheat growth and yield with the use of organic manure and compost when they were compared with chemical fertilizer. It is quite possible to get higher wheat yield by the integrated use of organic and inorganic fertilizers. Application of FYM was found to be responsible for improvement in different physiological characters in wheat viz. Chlorophyll- a, b content and heat stress tolerance of crop (KowsarJan and Boswal, 2015). Increase in plant height, number of tillers, dry matter production and grain yield due to the increased levels of NPK fertilizers combined with FYM was reported by Parewa and Yadav (2014). Significant grain yield increase in wheat crop with combined application of chemical fertilizers and FYM has been reported by Majundar et al. (2008); Kumar et al. (2005); Ram (2006). Effect of row spacing on wheat The optimum plant population is major contributory factor to crop yield, because it decides the active photosynthetic radiation absorption with sufficient leaf canopy (Hussain et al., 2014). For producing higher grain yield, number of plants per unit area should be enough higher in wheat; but not so to be restrict tillering and vegetative growth of plant. Hence, optimum row spacing is required to maintain proper crop geometry which is the yield determining factor for wheat. Narrow row spacing in wheat caused suppression of weeds by increasing ground cover, leaf area, light interception, and even spatial plant distribution (Weiner et al.., 2001; Drews et al., 2009). It also reduced soil evaporation and increased nutrient use efficiency by deploying nutrients (Johri et al., 1992; Chen et al., 2009). It has been shown by many studies, carried out in different climates, that narrow row spacing increased yield as compared to wider row spacing (Chen et al., 2008). However, in contrast some reports have also found that wider row spacing in wheat produced higher yield or was same as compared to narrow spacing (Hiltbrunner et al., 2005). Selecting optimal row spacing is important to improve crop productivity as plants growing in too wide of arrow may not efficiently utilize light, water and nutrient resources; however crops grown in too narrow spacing may result in severe inter row competition (Sandler et al., 2015). Row spacing also modifies plant architecture, Grains/spike 38.15a 38.45a 38.77a 1000 grain weight (g) 38.81b 38.80b 40.16a Grain yield (t/ha) 3.819b 3.866ab 3.922a photosynthetic competence of leaves and dry matter partitioning in several field crops (Hussain et al., 2012); Sharma and Bali (2001) reported the increase in uptake of N, P and K with narrow spacing of 15 cm than 20 cm which also produces taller plants, higher number of tillers and grain yield of wheat. Row spacing affect to growth and yield of wheat plants. Optimum row spacing helps to optimize tillering and ensured yield increase in wheat (Hussain et al., 2012). A number of researchers revealed that narrow row spacing gave better yield in wheat than wider row spacing (Johnson et al., 1988; Tompkins et al., 1991; Marshall and Ohm, 1987; Joseph et al., 1985); Frederick and Marshall (1985) reported that by decreasing row spacing to 12.7 cm, grain yield increased by 8.2%, and the main contributing factor was higher number of tillers per unit area. Narrow row spacing caused more even spatial plant distribution, increased leaf area index, crop ground cover, light interception and dry matter. Thus, narrow spacing also decreased weed population and reduced soil evaporation (Drews et al., 2009; Weiner et al., 2001; Chen et al., 2009); Lafond (1994) revealed that by increased row spacing caused 2 decreased number of spikes/m . Similarly, it was reported that narrow row spacing had higher plant density than at wider row spacing (McLeod et al., 1996). The higher 2 values of tiller/m in 15 cm row spacing in this study was likely due to more uniform and accurate spatial distribution and less plant-to-plant competition (Auld et al., 1983); Pandey et al., (2013) reported the non significant effect of different row spacing (15, 20 and 25 cm) on all the growth and yield parameters except number of effective tillers (viz. plant hight, dry matter, 1000 grain weight, seed yield). Whereas, Iqbal et al. (2010) found that row spacing of 15 cm produced higher plant growth and yield over 11.25 cm and 22.5 cm. Table 3 above. CONCLUSION Rice- wheat is the predominant cropping system in IndoGangetic Plain which provides staple food for population in the region. Rice cultivated as lowland with puddling gives more yield; but it decreases the yield of succeeding wheat crop because of disturbed and degraded soil properties and unfavorable root environment which lead to the poor wheat growth. Deep tillage along with integration of organic and inorganic sources of nutrients Published by Basic Research journal of Agricultural Science and Review Aniket et al. 301 may help to improve soil environment for increasing the growth and yield of wheat. Optimum row spacing is also an important factor which governs the crop growth characters and yield in wheat. REFERENCES Abdollahi F (2010). Influence of different rates of wheat resides and nitrogen on morpho physiological and agronomic characteristics and weeds in corn under three tillage systems. PhD dissertation in crop production, College of Agriculture, Shiraz University, Iran, pp: 234. Alam MK, Salahin N (2013). Changes in soil physical properties and crop productivity as influenced by different tillage depths and cropping patterns. Bangladesh Journal of Agricultural Research, 38(2): 289-299. Alijani K, Mohammad JB, Seyed AK (2012). 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