A field study was carried out to evaluate the growth and yield of BRRI dhan29 as influenced by different potassium level with recommended NPSZn fertilizer under the regional condition of Mymensingh during the period from February to May 2008. The changes in postharvest soil were also evaluated under the present study. The experiment was laid out in a Randomized Complete Block Design with three replications. The experiment consists of five treatments viz. T1: control, T2: NPSZn + K60, T3: NPSZn + K30(FLP) + K30(SA), T4: NPSZn + K90(FLP), T5: NPSZn + K45 (FLP) + K45(SA). Basal application was given with N, P, S, and Zn at the rate of 40, 7, 5, 0.5 Kg ha–1 as urea, triple superphosphate, gypsum and zinc oxide, respectively. The split application of K had a significant positive effect on plant height, tillers hill–1, effective tiller and unfilled grains panicle–1. The grain and straw yields were highly and positively influenced by split application of potassium. The highest grain yield (6.87 t ha–1) and straw (5.89 t ha–1) yields were recorded in T5 containing NPSZn + K45(FLP) + K45(SA). The uptake of K also increased gradually with K rates and the split application also showed better performance than single application. The concentration of K in soil solution depended on treatment and time of sampling. Split application of K showed lower solution K then single application.

 Key words: BRRI dhan29, split application, growth and yield