Abstract
Field experiments on P accumulated soils were conducted during 2009-10 and 2010-11 to assess (i) P fertilizer requirement and (ii) P fertilizer use efficiency using 32P isotope in rice–rice and rice–sunflower (rabi) systems. Four treatments in kharif (T1: 100%, T2: 75%, T3: 50% and T4: 25%) recommended dose of phosphorus (RDP) and three treatments in rabi (T1: 100%, T2: 75%, T3: 50% RDP) were tested. A uniform dose of 100% recommended 48 kg ha-1 of N and 24 kg ha-1 of K were applied along with P treatments. The P removal by both grain and straw by both crops under rice-rice system was at par with 100 and 75% RDP. The percent P utilization in entire system revealed that 75% RDP gave better utilization of applied P to a tune of 26% compared to 22% realized by 100% RDP in each crop. Similar trend of P removal by rice and sunflower seeds in rice-sunflower system was observed. Percent P utilization in both crops was 24.5% under 100% RDP and 27.2% under 75% RDP. The study clearly indicated 25% reduction in P fertilization for both cropping systems in high P soils.
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