NUTRIENTS DYNAMICS IN SOIL UNDER GINGER – PADDY LAND USE COVER
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Date
2009-03-13
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University of Agricultural Sciences GKVK, Bangalore
Abstract
An investigation was carried out to study the effect of fertilizers on ginger productivity, nutrient dynamics and transformations in soil and to assess the impact of ginger cultivation on the productivity of succeeding paddy crop and nutrients availability in soil. The results revealed that significantly higher growth and fresh yield of ginger rhizome (38797 kg ha-1) was obtained due to the application of higher dose of fertilizer at the rate of N100P75K125 kg ha-1. The rhizome recorded significantly higher and maximum content and uptake of K (244.29 kg ha-1), N (99.40 kg ha-1) and P (24.69 kg ha-1) followed by Ca, Mg and S and micronutrients uptake compare to shoot ant root, similarly higher oleoresin (9.68%) and crude fibre (5.58%) content in rhizome was recorded due to the application of N100P75K125 kg ha-1at harvest stage. Significant depletion of total and available N, K, Ca, Mg, S and micronutrients in soil below their initial level was noticed due to application of N100P75K125 kg ha-1 after harvest of ginger. On the contrary gradual and significant build up of available P status in soil was noticed with crop maturity and harvest stage. Further, at a given level of N and P, significant increase in yield and uptake of nutrients and significant depletion of nutrients in soil was noticed with increase in level of K application. The applied P was transformed in to dominant fraction of Fe-P followed by Al-P, RS-P, Ca-P, Sal-P and Occl-P, while soil K fraction was transformed in to more of Lattice-K followed by Non exch-k, exch-K and WS-K. With regard to performance of paddy after ginger, significantly higher residual paddy grain (6785 kg ha-1) and straw yield (9092 kg ha-1) and accordingly significantly higher content and uptake of macro and micro nutrients were registered due to the residual treatment supplied with N100P75K50 compared to other treatments. Significant decrease and lower status of both total and available N, K, Ca, Mg, and S and micronutrients in soil after harvest of paddy was observed except the total and available P status which accumulated more in the soil even after harvest of paddy.
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