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Effect of nitrogen fertilizer application on grain yield and milling recovery of rice (Oryza sativa cv. Khazar)
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Abstract: (4065 Views) |
| To evaluate the effect of application of different levels of nitrogen fertilizer on grain yield and yield components of rice (cv. Khazar), a field experiment was conducted at Rice Research Institute of Iran using a randomized complete block design with 11 treatments and three replications in 2008 cropping season. Nitrogen fertilizer levels (10, 20 and 30 kg.ha-1) were applied according to three chlorophyll meter (SPAD-502) reading thresholds (36, 38 and 40) on fully developed leaf of rice plant. Results showed that the maximum number of tiller.m-2 and tiller fertility was recorded in S40N30 (SPAD40+30 kgN) treatment with 242 tiller.m-2 and 90% tiller fertility. Maximum number of panicle.m-2 was recorded in S38N30 (SPAD38+30 kgN) treatment with 247.33 panicle.m-2, which had not significant difference with other treatments. Mean of highest grain number.panicle-1 (145.17) and maximum panicle fertility (68.51%) was recorded in S40N30 (SPAD40+30 kgN) and S38N30 (SPAD38+30 kgN) treatments, respectively. Highest rate of 1000-grain weight was recorded in S40N30 (SPAD40+30 kgN) treatment (29.60 g), as well as the maximum grain yield with 5559 kg.ha-1. Minimum grain yield was obtained in control treatment (without N) with 3454 kg.ha-1. Maximum milling recovery was also observed in S40N30 (SPAD40+30 kgN) treatment with 68.6% which was 7% higher than the recovery rate in recommended level of fertilizer and 28% greater than control. It can be concluded that splitting of nitrogen fertilizer application at appropriate rate, considering plant requirement, may improve grain yield, yield components and milling recovery in rice. |
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| Keywords: : Grain yield, Milling recovery, Rice, Split application of Nitrogen and Yield components |
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Full-Text [PDF 215 kb]
(1123 Downloads)
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2015/02/17 | Accepted: 2015/02/17 | Published: 2015/02/17
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