Assessment of Different Forms of Urea on Growth, Yield and Nitrogen Use Efficiency of Rice | Chapter 2 | Recent Progress in Plant and Soil Research Vol. 4

 In Bangladeshi soils, nitrogen is one of the most inadequate plant nutrients. Although nitrogenous fertilisers, particularly prilled urea, are widely utilised in rice cultivation, their efficacy is low when applied via the old broadcast method. For framers, urea is available as prilled urea, urea supergranules, and NPK briquettes. During the cropping season of 2014, a field experiment was conducted on Aus rice (May-August) in the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh, to assess the effects of different forms of urea (prilled urea, urea briquette, and NPK briquette) on growth, yield, and nitrogen use efficiency of BRRI dhan48. T1 [check (N0P16K42)], T2 [Urea briquette (one-3.4 g) (N52P16K42)], T3 (Urea briquette (one - 2.7 g (N78P16K42)], T4 [NPK briquette (one-3.4g) (N51P13K32), T5 [prilled urea (N78P16K42)], T6 [NPK briquettes (two With four replications, the experiment was set up as a Randomized Complete Block Design. Urea briquettes and NPK briquettes were deep placed (8-10 cm depth) at 8 DAT between four hills in alternating rows, while urea briquettes and NPK briquettes were deep placed (8-10 cm depth) at 8 DAT between four hills in alternate rows. After the first split application of urea and deep placement of urea briquette and NPK briquette, water samples from each treatment of rice fields were taken, and the second sampling was done after the second split of urea. For quantifying NH4+-N, each sampling was done for 7 days in a row. The results showed that the NH4+-N content in rice field water in PU treated plots peaked on day 2 and then gradually fell over time, whereas NH4+-N in rice field water in urea briquettes and NPK briquettes treated plots was very low. Treatment T3 had the maximum grain yield of 4.75 t ha-1 (69 percent higher than control). T3 also yielded the highest straw yield (5.49 t ha-1) among the treatments. The treatment T4 had the highest apparent N recovery and the highest N use efficiency. In compared to PU application, deep placement of urea and NPK briquettes reduced N losses and improved the recovery of applied N as well as N use efficiency.

Author(S) Details

M. R. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

S. B. Z. Sharna
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

S. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

M. Jahiruddin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

 View Book:- https://stm.bookpi.org/RPPSR-V4/article/view/5193