@inbook{oelsligle_mccollum_kang_1976, title={Soil fertility management in tropical multiple cropping}, DOI={10.2134/asaspecpub27.c14}, abstractNote={This chapter explores some basic concepts that are helpful in determining fertilization schedules for a particular multiple cropping pattern. The first step in determining any fertilization practice is an evaluation of the inherent soil nutrient supply. The commonly accepted method for estimating native soil fertility is a routine soil analysis. In tropical latitudes, fertility maintenance through applications of fertilizers or lime usually becomes necessary more quickly than elsewhere. The physical properties of a soil have a bearing on the timing of fertilizer applications as well as which fertilizer is applied. Relay intercropping is a common practice in wet-dry climates where the wet season is not sufficiently long for two full-season crops. Because row intercropping is one of the more extreme and perhaps least researched means of intensifying land use, the concept deserves special consideration with regard to fertility management. Residue management becomes an integral part of any fertilization program.}, number={27}, booktitle={ASA Special Publication}, author={Oelsligle, D. D. and McCollum, R. E. and Kang, B. T.}, year={1976}, pages={275} }