Long-term effect of fertilizer use on productivity and soil fertility in an irrigated rice-wheat system on different soil types
2000
Hegde, D.M. (Project Directorate for Cropping Systems Research, Modipuram (India))
This study evaluated the long-term effect of N. P. K. fertilizer on crop productivity and soil fertility in irrigated rice-wheat system. The results revealed that even with application of 120 kg P and 33.6 kg K/ha, both rice and wheat yields showed a declining trend over years on Eutrochrepts. Only rice yield on Hapludolls and Chromusterts and wheat yield on Udic Haplustalfs, Udic Fluvents-Fluaquents association and Aeric Ochroqualfs showed declining trend over years. Rice and wheat yields showed a linear increasing trend with NPK application on Aeric ochroqualfs and hapludolls, respectively. There was a general decline in organic carbon and available NPK and micronutrient status in most soil types due to contnuous rice-wheat cropping. N application had beneficial effect on organic carbon status and available N while P application helped significant buildup in available P content. because of general decline in soil fertility leading to declining yield trends either in rice or wheat or both crops on different soil types. It is suggested that only NPK application will not be able to sustain long-term productivity of irrigated rice-wheat system.
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