INTEGRATED USE OF FERTILIZERS AND MANURE IN T.AMAN RICE

Abstract

The study was performed at Shcr-e-Bangla Agricultural University (SAU) Farm on integrated use of fertilizers and manure in T. Aman rice (Var. BRRI dhan 33) during July to Nov. 2007. A Field experiment was conducted in combination with inorganic fertilizers and manure. The experiment was laid out in a randomized complete block design with eight treatments and four replications. The treatments were To (control), TL( K45S20 (Recommended dose), T 2 (50% NPKS + St ha 'CD), T3(70% NPKS + 3 t ha4 CD ). T 4 (50% NPKS + 4 t hi' PM ), T 5(70% NPKS + 2.4 t hi' PM ), T 6(50% NPKS + 10 1 hi' DH) and T7(70% NPKS + 6 It ha4 Dl-!). The result demonstrated that N 1 P 15 the yield contributing characters, grain and straw yields were significantly influenced by the added fertilizers and manure. Application of 50% of NPKS fertilizers plus 10 1 ha' dhaincha produced the highest grain yield (5085 kg hi') which was identical to that obtained with 70% of NPKS with 6 t ha4 dhaincha. In case of straw yield, the treatment 1'7 (70% NPKS + 6 t hi' DH) produced the highest yield (5470 kg hi') and the second highest straw yield (5250 kg hi') was obtained from i'6 (50% NPKS + 10 hi' DH) treatment. The grain yield increases over control and ranges between 15 to 76%. The treatments T 6 and T 7 resulted in higher nutrient use efficiency along with higher N. P. K and S uptake by the T. Aman rice. The application of inorganic fertilizer with manure influenced the nutrient concentration in rice grain and straw. The higher grain N, P, K and S concentrations were observed in the treatments where poultiy manure and dhaincha were applied in combination with N P K fertilizers. Grain yield of T. Aman rice was positively correlated with number of effective tiller, plant height, panicle length, filled grains panicle' and straw yield. The combined use of fertilizer and manure resulted in considerable improvement in soil fertility. The combined application of fertilizer and manure increased the % OC, total N, available P and available S in post harvest soils. The overall findings of this study indicate that the integrated use of fertilizer and manure should be encouraged to address the deteriorating soil fertility and increased crop yield of T. Aman rice.