On-farm nutrient depletion and buildup in vertisols under soybean (Glycine max) based cropping systems in semi arid Central India.

摘要

Information on nutrient depletion and build up in production systems in India is not only scarce but also mostly generalized especially under dryland conditions where fertilizer input levels are sub-optimal. On-farm nutrient balance study was taken up in 2000-2001 and 2001-2002 at Lalatora watershed in Madhya Pradesh with soybean-chickpea and soybean-wheat cropping systems. Soils of this watershed were low in N and P but were high in available K. In general, nutrient input levels were very low and in some cases even nil thereby yield levels of these cropping systems were also found low. Distribution of rainfall was considered as an important factor influencing the response of crops to nutrients. Overall, the soybean-chickpea system removed more nutrients than soybean-wheat system. Among nutrients, N and K were depleted from soil while P was buildup under both the cropping systems. Results of the study suggest that attention is needed towards net depletion of N and K and utilization of build up P as a residual effect in subsequent crops.