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• W2267037995 abstract "Conservation tillage requires higher amount of potassium application for augmenting crop productivity due to its stratitification (reduction in K supplying capacity in medium and long-term duration) in upper soil layer. To address this issue, a field experiment was carried out for five years (2002–03 to 2006–07) at Central Soil and Water Conservation Research and Training Institute, Research Farm, Selakui, Dehradun, Uttarakhand on a land with a gentle slope (2%) to study the effects of higher K application on grain yield, soil K status, carbon sequestration, soil erosion control and benefit: cost ratio in maize (Zea mays L)/cowpea (Vigna sinensis L.) based cropping systems under minimum tillage (MT). All crops recorded higher grain yields in the plots under higher (120 kg K2Oha−1) K application than the ones under recommended K (40 kg K2Oha−1). The five years’ mean yield data showed that the plots under higher K application produced 16% more maize equivalent yield than the recommended doses. Plots under cowpea based rotation yielded 14% higher crop productivity than the plots with maize based rotation. The added effects of higher K application in kharif (rainy season) crops also showed a significant enhancement in yield of winter crops [wheat (Triticum aestivum L.), lentil (Lens esculentum Medicus.) and mustard (Brassica juncea L.) and the maximum enhancement was found in the plots under cowpea-mustard rotation. Relationship between yield and sustainable yield indices revealed that only agronomic efficiency of mineral fertilizer input was significantly correlated with grain yield. Similarly, higher doses of K application not only increased the water use efficiency (WUE) of all the crops but also reduced runoff and soil loss by 17 and 16% under maize and by 23 and 20% under cowpea cover, respectively. On an average, 17% of left over carbon input contributed to soil organic carbon (SOC). Further, plots under cowpea based rotation with higher doses of K application recorded increased SOC contents. Over five years, the K balance coefficient for the plots under recommended rate was 0.67, indicating that more K was removed than applied. At the higher rate, the average K balance coefficient recorded was 1.29. Net return was also increased with the application of higher doses of K than recommended K and the trend was similar to that of grain yield. Thus, the present study demonstrates several beneficial effects of higher annual K application than the recommended dose to all crop rotations (especially to cowpea-mustard rotation), hence, the same is advocated for adoption by the farmers in this part of the country." @default.
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• W2267037995 date "2011-01-01" @default.
• W2267037995 modified "2023-09-24" @default.
• W2267037995 title "Potassium and crop rotation impact on productivity and resource conservation in maize and cowpea based cropping systems" @default.
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