Hydrus-1D for Simulating Potassium Transport in Flooded Paddy Soils. Issue 22 (16th December 2021)

• Record Type: Journal Article
• Authors: Shekhar, Shashank; Mailapalli, Damodhara Rao; Das, Bhabani Sankar; Mishra, Ashok; Raghuwanshi, Narendra Singh
• Is Part Of: Communications in soil science and plant analysis. Volume 52:Issue 22(2021)
• Page Start: 2803
• Page End: 2820
• Publication Date: 2021-12-16
• Subjects: Water flow -- potassium transport -- balance -- paddy -- Hydrus-1D; Soil science -- Periodicals; Plants -- Chemical analysis -- Periodicals; Agricultural chemistry -- Periodicals; 631.405
• DOI: 10.1080/00103624.2021.1966437
• Languages: English
• ISSNs: 0010-3624

Abstract

ABSTRACT: Understanding the transport of potassium (K) in flooded rice fields is important for the efficient management of K fertilizers. In this study, the data from lysimeter experiments were used for simulating the water flow and K transport using Hydrus-1D and the influence of split doses of recommended K fertilizer on its availability to paddy crop was investigated. Paddy crop was grown in non-weighing-type lysimeters. The depth of ponding water, soil matric potential heads, K concentration of ponding water and soil solution were measured during three paddy growing seasons. The Hydrus-1D model was calibrated and validated using the lysimeter data and simulated the water flow and K concentrations well. The deep percolation was 51–56% of the applied water and the K load in deep percolation was 0.3–0.7% of the total available K. About 56–62% of K is utilized by rice crop. The applied K was observed to be remained mostly within the top 20 cm soil depth and did not transport to deeper layers. The recommended dose of K fertilizer with four equal splits applied at four crop growth stages could increase the K availability to paddy throughout its growing period, and it may be the best K management practice for paddy.