Use of electrical conductivity in determining variable-rate nitrogen fertilizer and lime recommendations for sugarcane production
2015
Flores, A.M.
A study was conducted to determine the potential of using electrical conductivity (EC) in developing variable-rate nitrogen fertilizer and lime recommendation. Relationship of field EC with soil physico-chemical properties such as texture, CEC, pH, total N, available P and exchangeable bases including K, Ca and Mg were established. Soil samples representing the following series; Guimbalaon, Silay, Manapla, Pulupandan, San Manuel, La Castellana and Bago in La Carlota Sugar Mill District were used. Significant positive relationship was observed between field EC and soil pH, CEC, exchangeable Ca and Mg and clay content while negative correlation was noted between field EC and sand content. EC measurements were used to delineate boundaries and develop management zones. Mineralization potential and total N content were used to develop N fertilizer recommendations for the different zones. Soil pH, and exchangeable Ca and Mg content were used to determine lime requirement for each zone.
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