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Authors: Nand, Mani Mesha
Advisor: Singh, S. P.
Title: Potassium Partitioning at Different Growth Stages of Rice in Calcareous Soil of North Bihar
Publisher: Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur)
Language: en
Type: Thesis
Pages: 62+xv
Agrotags: null
Keywords: Rice, Potassium partitioning, Growth, Calcareous soil, North Bihar
Abstract: Ignorance of balanced nutrition with potash is diminishing crop yield and mining the potassium (K) from the soil. The knowledge on periodic uptake, accumulation and allocation of potassium to different parts of a rice plant should receive urgent attention in order to implement K management practices for sustainable rice production. Therefore, a field experiment was conducted in calcareous soil (medium in available K) in split-plot design with two rice varieties (Inbred and Hybrid) in main plot and six combinations of potassium management [control, NP (-K); NP+K(100 % basal); NP+K(50% basal + 50% tillering); NP+K(50% basal + 50% panicle) and NP+K(50% basal + 25% tillering + 25% panicle)] in sub-plot at Experimental Farm, RPCAU, Pusa, Samastipur, during kharif - 2017. Dry weight, potassium content and uptake by different parts of rice (root, shoot and leaves) and availability of potassium (K) in soil were determined at different growth stages (tillering, panicle, milking and maturity) of rice. Initial and post-harvest soils (0-15 cm) were analyzed for physico-chemical properties, viz., pH, electrical conductivity (EC), organic carbon (OC) and different forms of potassium (available K, water soluble K, exchangeable K, non-exchangeable K, lattice K and total K). The results revealed that the growth parameters (dry weight, plant height, panicle length, number of tillers m-2, number of panicles m-2), potassium content and uptake, grain yield and test weight increased significantly with the application of potassium in three splits (50% basal + 25% tillering + 25% panicle) as compared to the treatment where potassium was applied only as basal dose (recommended practice). The availability of K in the soil at different growth stages of rice was found to improve with split applications of potassium over basal application. At tillering stage, available K was highest in the plots receiving split applications of K i.e. 50% basal + 50% tillering, while, at panicle and milking stage, available K was highest in plots with split application of K i.e. 50% basal + 50% panicle. At maturity, it was highest in the plots with three split applications of K (50% basal + 25% tillering + 25% panicle). The effect of potassium application on changes in different forms of potassium at harvest was not significant except water soluble K which increased significantly by three split applications of potassium. Negative potassium balance in soil was recorded under all the treatments and it was more pronounced in hybrid rice than the inbred rice grown soils. Thus, it can be concluded that synchronization of split applications of potassium (50% basal + 50% panicle or 50% basal + 25% tillering + 25% panicle) with nitrogen can result in significantly higher yield of rice and K uptake compared to basal application. Although, the K rates for fertilizer recommendation need to be revised to account for the negative K balance in soil.
Subject: Soil Sciences
Theme: Balanced nutrition with potash for crop yield and mining the potassium (K) from the soil
These Type: M.Sc
Issue Date: 2018
Appears in Collections:Thesis

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