Yield and soil status disparity under rice-wheat cropping system: A 40 years Journey

Abstract

Long-term soil fertility experiment is valuable for evaluating the effects of continuous cropping on the capacity of a soil to sustain nutrient supply and the productivity. Thus, experiment was conducted to know the impact of different dose and source of fertilizers on crop yields under rice-wheat system in Directorate of Agricultural Research (DoAR), Bara. The experiment was carried out in Randomized Complete Block Design (RCBD) with 12 treatment and three replication from 1991 to till date. In this study, we used the latest seven years data viz. 2015. 2016. 2017, 2018, 2019, 2020 and 2021 for evaluating the yield and yield attributes of rice.  The result showed that 50%N +FYM treated plot fb 100:30:30 NPK provided stable yield 3670-3835 kg/ha in rice and 2505-2694 kg/ha in wheat.  However, inherent soil nutrient capacity still supporting more than 1999±550 kg/ha yield without any fertilizer application. The use of NPK plot had higher yield in decreaing trend and decreasing soil status. The pH was highly reduced in other treatment to average 5.4 but remain slightly decline in control from initial. The organic matter , N,P, and K was constantly high in FYM treated plot but notice declined in other plot  So, this concluded that use of organic matters with reduce N could provide stable and higher yield and enhance soil status over long period of time.