Balanced Fertiliser Use in Black Soils

Nageswara Rao, V and Rego, T J and Myers, R J K (1997) Balanced Fertiliser Use in Black Soils. Fertiliser News, 42 (4). pp. 35-45.

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Twenty five percent of worlds total area of Vertisols and Vertic inceptisols occur in India. Nearly 79% of sorghum, 60% of cotton, 45% of pigeonpea and 41% of groundnut are grown in these soils. Because of their high water holding capacity these soils were considered productive and were under cultivation since hundreds of years. Most of these soils are low in nitrogen and to a Jesser extent deficient in phosphorus. Zinc is also becoming important in these soils. It has been shown both on farmers' fields as well as on research stations that most of the crops significantly respond to applied N However, only cash crops like cotton, chillies, tobacco or irrigated crops like rice and sugarcane are well fertilised in these soils. Staple food crops like sorghum or millet hardly receive 18 kg/ha of nutrients. In order to achieve improved and sustained productivity a balanced nutrient management is a must. We suggest that after demarketing different agroclimatic zones in the Vertisol area, we have to calculate the nutrient requirement of suitable crops for these zones. Nutrient supplying capacity of these zones is estimated either through soil tests or using GIS and modelling approach. After taking into account the farm available nutrient sources, fertilizer application can be made to achieve balanced nutrient supply. Systems simulation modelling will help to avoid climatic risk in the investment of fertilizers especially under dryland conditions.

Item Type: Article
Subjects: Others > Fertilizer Applications
Depositing User: Library ICRISAT
Date Deposited: 17 Sep 2011 05:06
Last Modified: 19 Dec 2013 04:00
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Acknowledgement: UNSPECIFIED
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