Modeling the response of cassava to fertilizers: A site-specific nutrient management approach for greater tuberous root yield

Byju, G. and Nedunchezhiyan, M. and Ravindran, C.S. and et al, . (2012) Modeling the response of cassava to fertilizers: A site-specific nutrient management approach for greater tuberous root yield. Communications in Soil Science and Plant Analysis, 43 (8). pp. 1149-1162.

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Abstract

Conventional fertilizer-management strategy results in decreased fertilizer-use efficiency and unbalanced nitrogen (N)–phosphorus (P)–potassium (K) applications. The quantitative evaluation of fertility of tropical soils (QUEFTS) model was used for determining region-specific balanced NPK uptake requirements and recommendations for a target yield of cassava. Minimum and maximum internal efficiencies of N, P, and K were estimated as 35 and 80 for N, 250 and 750 for P, and 32 and 102 for K (kg tuberous root per kg nutrient removed). Linear increases in tuberous root yield with N, P, and K uptakes of 17.6, 2.2, and 15.6 kg N, P, and K per 1000 kg tuberous root yield were observed. Relationships between soil supply and soil chemical properties and between fertilizer nutrient recovery efficiencies with their rates of application were developed for major cassava-production regions. Good agreement between measured and predicted yields was observed while calibrating the model, which shows that the model can be used for making site-specific NPK recommendations for cassava in major cassava production regions of India

Item Type: Article
Uncontrolled Keywords: Cassava, internal efficiency, indigenous nutrient supply, QUEFTS, recovery efficiency
Author Affiliation: Central Tuber Crops Research Institute , Kerala , India
Subjects: Crop Improvement
Divisions: Other Crops
Depositing User: Ms K Syamalamba
Date Deposited: 15 Jul 2014 03:25
Last Modified: 15 Jul 2014 03:25
Official URL: http://dx.doi.org/10.1080/00103624.2012.662563
URI: http://eprints.icrisat.ac.in/id/eprint/13335

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