Yield and yield attributes of upland rice (Oryza sativa L.) as influenced by P dose and partial N substitution

Abstract

A field experiment was conducted in the Instructional farm, College of Agriculture, Vellayani, Thiruvananthapuram during Kharif, 2018 to study the influence of P dose, to assess the feasibility of partial substitution of inorganic N with FYM, VC and in situ green manure cowpea on yield of upland rice. The variety used was Aiswarya (PTB 52). The yield attributes and yield viz., number of productive tillers m-2, weight of panicle, number of spikelets panicle-1, number of filled grains panicle-1, grain yield, straw yield and harvest index were favorably influenced by treatments. Application of 30 kg P205 ha-1 and 120 kg N ha-1 through 50% N as CF, 25% N as FYM and in situ green manure cowpea (T5) recorded the maximum yield attributes and yield except number of spikelets panicle-1. The treatment T5 recorded maximum grain and straw yields of 3357 and 4133 kg ha-1 respectively and was on par with T6 and superior to other treatments. The maximum HI of 0.45 was recorded by the treatments T5 and T6.