Contribution of Nutrients through Critical Irrigation from Diverse Water Sources in Selected Watersheds of Semi-arid Tropical India

Srinivasa Rao, Ch and Wani, S P and Sahrawat, K L and Jakkula, V S and Kundu, S and Rajashekar Rao, B K and Marimuthu, S and Pathak, P and Rajesh, C and Pardhasaradhi, G (2012) Contribution of Nutrients through Critical Irrigation from Diverse Water Sources in Selected Watersheds of Semi-arid Tropical India. Indian Journal of Dryland Agriculture Research and Development, 27 (1). pp. 58-69. ISSN 0971-2062

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Abstract

Critical irrigation is one of the most important management options to protect the crop during weather aberrations like dry spells at critical stages of the crop growth in semi arid condition. Various water harvesting structures are useful in watershed areas to cope up with mid-season droughts. These structures provide critical irrigations at sensitive crop growth stages by which they supply essential nutrients to some extent. We estimated the contribution of various sources of water in terms of plant nutrients and to what extent critical irrigations meet nutrient requirements of various crops. By giving 4 cm irrigation, the maximum major nutrient (kg ha-1) addition in the studied watersheds is of the following order NO3 (5.2, Kothapalli); SO4 (15.2, Kolar); Na (72.0, Haveri); K (3.6, Govardhanapura); Ca (38.5, Semli and Shyamapura); Mg (20.5, Kothapalli) and for micronutrients (g ha-1) Fe (109, Kolar); Zn (40, Kothapalli); Mn (90, Kolar); Cu (120, ICRISAT) and B (190, ICRISAT). Percentage of recommended dose of nutrients which can be met by three irrigations in cereal crops (5- 10, 15-100, 10-20% in N,S,K respectively); legumes (5-30,10-100, 5-10% of N,S,K respectively); cotton (10-15, 25-30, 5-10% of N,S,K, respectively) and micronutrients such as Fe, Zn, Mn, Cu and B to the full extent. With the number of critical irrigations increased, application of secondary and micro nutrients should be avoided which otherwise leads to higher cost of alleviation and environmental pollution.

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Uncontrolled Keywords: Watershed, Water Sources, Nutrient Contribution, Critical Irrigation, Management Practices, Rainfed Crops
Subjects: Others > Soil Science
Others > Watershed Management
Others > Agriculture-Farming, Production, Technology, Economics
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 07 Feb 2013 13:57
Last Modified: 07 Feb 2013 13:58
URI: http://oar.icrisat.org/id/eprint/6536
Official URL:
Projects: UNSPECIFIED
Funders: BAIF Development Research Foundation
Acknowledgement: The author would like to thank BAIF Development Research Foundation, MYRADA for their collaboration and would also like to thank technical staff of ICRISAT; L. Mohan Rao, L.J.Naidu, Ch. Sreenivasa Rao, Mathur, Pal, Nageshwar Reddy and all the participant farmers
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