Potassium Balance under Soybean–wheat Cropping System in a 44 Year Old Long Term Fertilizer Experiment on a Vertisol. Issue 2 (19th January 2022)

• Record Type: Journal Article
• Authors: Pathariya, Priyanka; Dwivedi, B.S; Dwivedi, A.K.; Thakur, R.K.; Singh, Muneshwar; Sarvade, S.
• Is Part Of: Communications in soil science and plant analysis. Volume 53:Issue 2(2022)
• Page Start: 214
• Page End: 226
• Publication Date: 2022-01-19
• Subjects: K-fractions -- long term fertilizer experiment -- k uptake -- organic manure -- vertisol; Soil science -- Periodicals; Plants -- Chemical analysis -- Periodicals; Agricultural chemistry -- Periodicals; 631.405
• DOI: 10.1080/00103624.2021.1984516
• Languages: English
• ISSNs: 0010-3624

Abstract

ABSTRACT: Applications of fertilizers alone and in combination with organic manure significantly increased the organic carbon, available nitrogen, phosphorous, potassium, and K fractions, i.e., water soluble-K, exchangeable-K, non-exchangeable-K, lattice-K, and total-K in both surface and subsurface soils and without K input (100% NP & 100% N). Among the various K fractions, lattice K was the dominant K fraction. The highest values of these fractions were found in 100% NPK + 5 t FYM ha −1 . The relative contents of these fractions were in order, lattice-K > non-exchangeable K > exchangeable K > water soluble K, and these were higher in surface than the subsurface soils. Correlation studies revealed significant positive relationship of organic carbon and available N, P, and K with different K fractions in surface and subsurface soils. Furthermore, the minimum depletion of the K rate was recorded in 100% NPK + FYM (−2.25 kg ha −1 yr −1 ) to that of other treatments, while control showed a maximum K depletion rate (−3.86 kg ha −1 yr −1 ). Apparent K balance in soil was the lowest, −61 kg ha −1 yr −1, in control plot followed by −165 kg ha −1 yr −1 in the treatment of 100% NPK + FYM. Hence, much attention is required for potassium fertilizers to maintain the K status of soil and to prevent K mining.