EFFECT OF DIFFERENT LEVELS OF PHOSPHORUS ON T-AMAN cv. BINA dhan7

Abstract

A study was conducted to investigate the effect of different levels of phosphorus fertilizer on the availability of soil phosphorus and T-aman (cv. BINA dhan7) yield during kharif-2 season of 2012 at three locations (L;: Kunder Ali, Sadar, Panchagarh, L,: HSTU, Dinajpur and L;: Palashbari, Parbatipur, Dinajpur). The experiment was designed with six treatments in three locations and laid out in a Randomized Complete Block Design (RCBD) with three replications. The treatments were, To: control (0 kg), T,: 25 kg, Tp: 50 kg, T3: 75 kg, Ty: 100 kg and Ts: 37.5 kg ha’' TSP was applied. The optimum rate of P fertilizer application needs to be determined on the basis of available P in the soil and also P requirement and utilization efficiency of the crop. The yield of rice was significantly varied with different treatments in three locations. The yield contributing characters such as tillers hill’, grains panicle” and yield hill’ varied significantly with different levels of P. The highest grain yield 2.86, 6.55 and 4.80 t ha’'was found in T; treatment at location L,, L2 and Ls, respectively. The highest straw yield was recorded 7.96, 9.22 and 8.02 t ha’ also in Ts treatment at location L,, L, and L;, respectively. The lowest grain and straw yield t ha’ were recorded in control at three locations. The grain and straw yield due to different treatments ranked in the order of Ts> T,>T3> T2>T)>Tpo and in three location it was L.>L3>L). Soil test basis (STB) fertilizer application showed maximum feedback. The chlorophyll, protein, N, P, K, Ca, Mg, S, Zn, B, Cu, Fe and Mn content of flag leaves due to different levels of P were markedly different and were highly significant among three locations. More or less similar trend was also observed in yield contributing characters, i.e., tillers hill, grains panicle’ and yield hill’. The available soil P and Ca showed significant variation in different treatments. The soil OM, N, K, S, Zn, Mg, Cu, Fe and Mn was increased but B was decreased due to different P levels in the different stages of rice growth period than initial soil. The soil pH was changed at different growth stages of rice due to dolomite application. The nutrient elements of soil varied significantly in the three locations and at different growth stages of BINA dhan7 rice. Based on different parameters studied, soil test basis fertilizer can be recommended for higher yield as well as the farmers practice.