Illustrated Concepts in Tropical Agriculture, 1970 - 1981
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Item Green Manuring—Renewed Interest in an Old Concept(University of Hawaii, 1981) Yost, R.S.; Evans, D.O.; Saidy, N.A.; Fox, R.L.Three tropical green manure legumes were grown across a pH gradient from 4.7 to 7.1 established by liming an Oxisol. The effects of available soil aluminum and manganese levels on plant growth and nitrogen fixation are discussed.Item Liming in the Tropics: Variable-Charge Soils May Be Highly Buffered(University of Hawaii, 1981) Fox, R.L.; Saidy, N.A.; Yost, R.S.Yield response of cowpea over a pH gradient established by applying incremental amounts of lime to an Oxisol is illustrated and discussed.Item Mapping Soil Fertility and Fertilizer Requirements(University of Hawaii, 1980) Fox, Robert L.; Yost, Russell S.A map of fertilizer phosphorus requirements for the island of Hawaii is discussed. It shows the amount of P fertilizer required per gram of dry soil to establish 0.02 microgram P per milliliter of soil solution, a level that is capable of producing near-maximum yields of many agronomic crops.Item Amorphous Coatings on Soil Mineral Surfaces Sorb Phosphate and Sulfate(University of Hawaii, 1978) Jones, Rollin C.; Fox, Robert L.Soils formed in weathered volcanic ash usually contain a high percentage of amorphous gel-like material that has been desilicated during weathering. The influence of this property on phosphate and sulfate sorption is discussed.Item The External Phosphorus Requirements of Plants(University of Hawaii, 1980) Fox, Robert L.; Nishimoto, Roy K.The dynamic between labile P, soil solution P, and P uptake by lettuce and Chinese cabbage is illustrated.Item Symbiotic Nitrogen Fixation by Legumes Requires Extra Phosphorus(University of Hawaii, 1980) Cassman, Kenneth; Whitney, A Sheldon; Fox, Robert L.Soybean plants that depend upon symbiotic nitrogen fixation for their N have a higher P requirement than their counterparts supplied with fixed N from an external source.Item Premature Leaf Senescence of Banana—A Symptom of Potassium Exhaustion(University of Hawaii, 1980) Fox, Robert L.; Lower, RobertTropical soils may lack reserves of available K due to nutrient leaching, and harvesting of K-rich crops such as banana may deplete the limited reserves. Symptoms of gradually increasing K deficiency over a 6-year period are illustrated and described.Item Nitrogen and Potassium Interact to Shape a Yield Response Surface(University of Hawaii, 1980) Fox, Robert L.; Lower, Robert; Warner, Robert M.In a field experiment with banana, fertilizer variables were applied systematically in strips across the blocks so that N increased gradually from none to large quantities in one direction, while K increased gradually perpendicular to the N fertilizer. An aerial view of the blocks and a plot of banana yields as influenced by the variables illustrate the interaction of the nutrients applied.Item Matching Crop Requirements to Land Characteristics(University of Hawaii, 1980) Manrique, Luis A.; Harris, David J.; Uehara, GoroExamples of matching crop, soil, and season are given; implications for technology transfer in the tropics are mentioned.Item Mycorrhizae Enhance Nutrient Uptake from Infertile Soils(University of Hawaii, 1980) Yost, Russell S.; Fox, Robert L.A field experiment to illustrate how removing soil mycorrhizae through fumigation affects the growth of crops dependent on the symbiosis is discussed.
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