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.

Traditional Indica rice varieties offered little chance of yield response to increased nitrogen fertilizer because they were prone to lodging (bending over) when they grew too tall. Development of dwarf rice cultivars with ...

Yield response of cowpea over a pH gradient established by applying incremental amounts of lime to an Oxisol is illustrated and discussed.

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 ...

Molybdenum is required by N-fixing soil rhizobia, but it may be deficient in acidic tropical soils. An experiment with soybeans on an Oxisol showed that while added N could compensate for Mo deficiency in the soil, growth ...

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 ...

Tropical 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 ...

The importance of depth of rooting during seasonal droughts is illustrated, and the facts that influence rooting depth are discussed.

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.

The manner in which phosphorus inputs affect expression of zinc deficiency on corn growing in a soil (a Hydrandept) with high phosphorus immobilization ("fixation") capacity is illustrated with photographs.