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Shah J.A.,Soil Science Division Nuclear Institute of Agriculture | Memon M.Y.,Soil Science Division Nuclear Institute of Agriculture | Aslam M.,Soil Science Division Nuclear Institute of Agriculture | Depar N.,Soil Science Division Nuclear Institute of Agriculture | And 2 more authors.
Pakistan Journal of Botany | Year: 2011

Boron is the deficient micronutrient in the soils of Pakistan. Boron (B) deficiency is wide spread in rice growing areas of Pakistan. Low and very high soil B depress grain yield of cereals. A field experiment was conducted to determine the effect of different levels of B on the yield and yield components of rice genotypes. Two rice varieties viz., Khushboo-95 and Mehak were grown in field with four B levels 0, 0.5, 0.75 and 1.0 kg ha-1. The application of boron at 0.5, 0.75 and 1.0 kg ha-1 enhanced the paddy yield of Khushboo-95 by 9, 13 and 19% and Mehak by 7, 11 and 15%, respectively. The calculated VCR (value cost ratio) of Khushboo-95 enhanced by 12.1, 14.3 and 15.4 and Mehak by 9.5, 11 and 11.5, respectively over control with the each increment of B level. Boron application @ 0.75 and 1.0 kg ha-1 significantly enhanced the straw yield of Khushboo-95, whereas the straw yield of Mehak was significantly increased at 1.0 kg B ha-1. The effect of boron application was not observed on plant height and number of branches per panicle in both varieties. The number of productive tillers/plant, panicle length and 1000-grain weight of both varieties and number of grains/panicle in Khushboo-95 were significantly enhanced at 1.0 kg B ha-1. Boron concentration in youngest fully developed leaves of both varieties was significantly enhanced with each increment of applied B.

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