Effect of varying sources and levels of boron on potassium, calcium and magnesium uptake and yield of rice (Oryza sativa L.)
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Date
2022-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present experiment “Effect of varying sources and levels of boron on potassium, calcium and magnesium uptake and yield of rice (Oryza sativa L.). was carried out during the kharif - 2021 at the E1 block of Norman E. Borlaug Crop Research Centre of the Govind Ballabh Pant University of Agriculture and Technology, Pantnagar. Two sources of boron, borax and boric acid at 0.11% and 0.22% levels of B were applied through foliar sprays at 30 DAT and 60 DAT. The experiment was laid in RBD and replicated three times with ten treatments. The initial soil sample had 0.40 mg kg-1 B, 145.45 mg kg-1 Ca and 12.5 mg kg-1 Mg. The foliar spray of borax and boric acid at different levels significantly increased the dry matter accumulation, crop yield and yield attributes. The content and uptake of B, K, Ca and Mg also, significantly improved over the control on application of different sources and levels of B. The maximum B uptake in grain and straw (16.00 g ha-1 and 63.13 g ha-1); K uptake in grain and straw (17.63 kg/ha and 161.27 kg/ha) and Ca uptake in grain and straw (4.08 kg ha-1 and 21.90 kg ha-1) were observed in treatment T6 (0.22% B through borax source with two sprays). Whereas, maximum Mg uptake in grain and straw (2.36 kg ha-1 and 15.57 kg ha-1) was observed in treatment T7 (0.11% B through Boric acid with one spray). The treatment (T6 ) having 0.22% B (Borax) with two sprays, in general, was found best among all the treatments which improved the dry matter accumulation, crop yield, yield attributes, nutrient content and nutrient uptake in rice crop. It is thus concluded from this study that the use of varying sources and levels of boron significantly improves the crop yield, yield attributes, nutrient content and nutrient uptake in rice crop.