Organic and Inorganic Integrated Fertilization Improves Non-exchangeable Potassium Release and Potassium Availability in Soil. Issue 16 (8th September 2019)

• Record Type: Journal Article
• Authors: Sanyal, Debankur; Brar, B.S.; Dheri, G.S.
• Is Part Of: Communications in soil science and plant analysis. Volume 50:Issue 16(2019)
• Page Start: 2013
• Page End: 2022
• Publication Date: 2019-09-08
• Subjects: Non-exchangeable potassium release -- integrated fertilization -- rice-wheat cropping systems -- kinetic models; Soil science -- Periodicals; Plants -- Chemical analysis -- Periodicals; Agricultural chemistry -- Periodicals; 631.405
• DOI: 10.1080/00103624.2019.1648660
• Languages: English
• ISSNs: 0010-3624

Abstract

ABSTRACT: Potassium (K) plays several key roles in plant metabolism and crop productivity. Non-exchangeable K (NEK) makes K available in soil and to the crops. Impact of integrated use of organic and inorganic fertilizers on NEK release was studied in an ongoing long-term fertilizer experiment (LTFE) under rice-wheat cropping system. The experimental plots in the field were laid out following a randomized complete block design (RCBD) with eight treatments and three replications. Addition of K increased the release of NEK, but integrated use of manure with fertilizers increased K release of NEK from soils than the use of inorganic K alone. The maximum NEK (102 × 10 –2 cmol kg −1 of soil) was released under 100% NPK with Farm Yard Manure (FYM) treatment and the minimum (93.9 × 10 –2 cmol kg −1 of soil) under 100% NP-treated soils. Four kinetic models, parabolic diffusion, first order, power function, and Elovich, were tested for characterizing K release data and Elovich model provided the best fit (R 2 = 0.96–0.97). Available K status in soils, rice yield, and plant K uptake increased significantly with the increase in NEK release rate. Our research outcomes suggest that the addition of K through integrated fertilization is needed to improve plant nutrition and productivity of the intensive rice-wheat cropping systems.