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Different Forms of Potassium and Their Contributions toward Potassium Uptake under Long-Term Maize ( Zea mays L.)–Wheat ( Triticum aestivum L.)–Cowpea ( Vigna unguiculata L.) Rotation on an Inceptisol.
- Source :
-
Communications in Soil Science & Plant Analysis . Mar2012, Vol. 43 Issue 6, p936-947. 12p. - Publication Year :
- 2012
-
Abstract
- In a long-term fertilizer experiment at the Indian Agricultural Research Institute, New Delhi, with maize, wheat, and cowpea, various forms of potassium (K) and their contribution toward K uptake were found to be affected by fertilizer use and intensive cropping. The treatments included for the study were a control, 100% nitrogen (N), 100% N–phosphorus (P), 50% NPK, 100% NPK, 100% NPK + farmyard manure (FYM at 15 t ha−1 to maize only), and 150% NPK. The concentration of nonexchangeable K was greatest, followed by exchangeable K and water-soluble K. The study revealed no significant change in water-soluble K concentration in surface soil compared to N, NP, and control, indicating existence of an equilibrium between different K forms. Application of 100% NPK significantly increased water-soluble K concentration in surface soil compared to N, NP, and control treatments after maize, wheat, and cowpea. Application of NPK + FYM and 150% NPK resulted in greater quantities of all the K forms as compared to other treatments. Among the three forms, water-soluble K contributed predominantly to K uptake by maize and wheat; however, nonexchangeable K contributed significantly to K uptake by cowpea. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 00103624
- Volume :
- 43
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Communications in Soil Science & Plant Analysis
- Publication Type :
- Academic Journal
- Accession number :
- 73888087
- Full Text :
- https://doi.org/10.1080/00103624.2012.653029