Long-term effects of soil management practices on soil Zn chemical fractions and their availability to grain sorghum {Sorghum vulgare (L.)} grown in a yearly rotation with castor (Ricinus communis) in rainfed red Alfisol soils. Issue 2 (19th January 2020)

• Record Type: Journal Article
• Authors: Lal, Munna; Sharma, K.L.; Indoria, A.K.; Reddy, K. Sammi; Charry, G. Ravindra; Srinivas, K.; Prabhakar, M.; Parmar, Brajendra; Chandrika, D. Suma; Vasavi, M.; Haindavi, P.; Gayatri, D.L.A.
• Is Part Of: Communications in soil science and plant analysis. Volume 51:Issue 2(2020)
• Page Start: 276
• Page End: 287
• Publication Date: 2020-01-19
• Subjects: Zinc fractions -- Zn availability -- tillage -- residue levels -- N levels -- rainfed -- Alfisol; Soil science -- Periodicals; Plants -- Chemical analysis -- Periodicals; Agricultural chemistry -- Periodicals; 631.405
• DOI: 10.1080/00103624.2019.1705326
• Languages: English
• ISSNs: 0010-3624

Abstract

ABSTRACT: A study was conducted at Hayathnagar Research Farm of ICAR-Central Research Institute for Dryland Agriculture to assess the long-term effects of soil management practices viz. tillage, residue application and N levels on soil Zn fractions and their contribution to soil Zn availability and uptake by grain sorghum grown in a yearly rotation with castor. Results of the study clearly revealed that tillage significantly influenced the Water soluble + Exchangeable Zinc (Zn-CA), zinc specifically sorbed by inorganic sites (Zn-ACC) and available Zinc (Zn-DTPA). However, the remaining Zn fractions were not influenced significantly. Residue application on long-term basis significantly increased the amount of zinc in all the fractions except water soluble + exchangeable Zinc (Zn-CA), and residual zinc (Zn-Res). The application of N @ 90 kg ha −1 resulted in a higher amount of zinc in different fractions compared to control. The multiple regression analysis conducted between Zn-DTPA and zinc fractions revealed that the order of magnitude of the positive contribution of the zinc fractions toward zinc availability pool (DTPA-Zn) was: Zn-CA > Zn-ACC > Zn-OX > Zn-Res. The coefficient of multiple determination (R 2 = 0.89) was significant at p = .05 level of significance. The order of percent contribution of Zn fractions toward the sum total of all the fractions was: Zn-Res > Zn-PYR > Zn-OX > Zn-ACC > Zn-CA. The multiple regression studies also revealed that all the zinc fractions studied significantly contributed toward Zn uptake by the sorghum crop (R 2 = 0.99). Relatively, significantly higher Zn uptake was recorded by sorghum crop under minimum tillage (0.11 kg ha −1 ) as compared to conventional tillage (0.10 kg ha −1 ). The results of this study will be highly useful in regulating the Zn availability in soil through soil management practices.