Abstract
An experiment was conducted at the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during the aman season of 2012 to investigate the effects of prilled urea (PU), urea super granule (USG) and NPK briquette on NH4- N concentration in field water, yield and nitrogen (N) use efficiency (NUE) of BR22 rice under reduced water conditions. The experiment was laid out in a randomized complete block design with three replications. There were altogether eight treatment combinations viz. T1: Control (No N fertilizer), T2: 52 kg N ha-1 from USG, T3: 104 kg N ha-1 from USG, T4: 78 kg N ha-1 from PU, T5: 120 kg N ha-1 from PU, T6: 51 kg N ha-1 from NPK briquette, T7: 78 kg N ha-1 from USG and T8: 78 kg N ha-1 from NPK briquette. Water samples were collected from rice field for seven consecutive days after deep placement of USG and the first split application of PU and the samples were analyzed for NH4-N. The Highest concentration of NH4-N in water was observed at the second day of PU application followed by gradual decrease with time. The yield contributing characters like plant height, panicle length, number of effective tillers hill-1 and grains panicle-1 were significantly influenced by different treatments. The highest grain yield of 3.93 t ha-1 was recorded from 104 kg N ha-1 as USG (T3) and the lowest value of 2.12 t ha-1 was obtained from control. The N use efficiency was increased when the N was applied as USG. The overall results revealed that application of USG and NPK briquette may be practised for obtaining better yields in addition to increasing the efficiency of N fertilizer. DOI: http://dx.doi.org/10.3329/jbau.v11i2.19897 J. Bangladesh Agril. Univ. 11(2): 215-220, 2013
Highlights
Rice is one of the most important cereals in the world
Information regarding a comparative performance of prilled urea (PU), urea super granule (USG) and NPK briquette as the sources of N for rice cultivation and the availability of NH4-N in rice field water in Bangladesh are limited
The present study was undertaken to evaluate the effect of PU, USG and NPK briquette on N use efficiency and yield of BR22 rice under reduced water condition
Summary
Rice is one of the most important cereals in the world It is the staple food for more than half of the world’s population and grows in more than 100 countries. The efficiency of applied N from urea fertilizer is very low (30-35 %) in rice cultivation. The low utilization efficiency is attributed to losses like volatilization, denitrification, leaching and surface run-off These losses can be reduced by management practices like proper timing, rate and modified forms of urea and deep placement of N fertilizers. Deep placement of fertilizers (USG and NPK briquette) into the anaerobic soil zone is an effective method to reduce volatilization loss (Mikkelsen et al, 1978). The present study was undertaken to evaluate the effect of PU, USG and NPK briquette on N use efficiency and yield of BR22 rice under reduced water condition
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