Phosphorus Requirement and Its Use Efficiency in Zero Tilled Maize After Kharif Rice
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Date
2013
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Badan Penelitian dan Pengembangan Pertanian
Abstract
Field experiment was conducted during Rabi 2010-11 and Rabi 2011-12 at the College Farm, College of
Agriculture, Rajendranagar, Hyderabad, to study the effect of different phosphorus levels (0, 25, 50, 75, and 100%
the recommended dose of phosphorus) on yield and phosphorus uptake parameters of zero tilled maize grown after
kharif rice by using P32 radio isotope. The maize grain and stover yields increased by 45 and 34%, respectively, over
the control due to application of 100% recommended dose of phosphorus (RDP). Application of 100% RDP gave the
highest yields of maize grain (5478 kg/ha) and stover (7773 kg/ha) than those on plots applied with the other levels
of P fertilizer. The highest dry matter yield (6627 kg/ha) and P uptake (12.08 kg/ha) at flowering stage were recorded
at 100% RDP. The percentages of P derived from the fertilizer and the P uptake by maize plants at flowering stage
increased up to 75% RDP while at 100% RDP it decreased slightly. The highest percentages of P derived from the P
fertilizer (10.44%) and the P uptake (1.21 kg/ha) were noticed when P was applied at 75% RDP. The percentages of
P use efficiency decreased from 10.6% at 25% RDP to 6.8%, 6.1%, and 4.3%, respectively, due to the increase in
P applications at 50%, 75%, and 100% RDP.