Browsing by Author "P. Venkata Reddy"

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    Phosphorus Requirement and Its Use Efficiency in Zero Tilled Maize After Kharif Rice
    (Badan Penelitian dan Pengembangan Pertanian, 2013) A. Madhavi; P. Venkata Reddy
    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.