AGRI-BRIEFS
  AGRONOMIC NEWS ITEMS
From Agronomists of the
Potash & Phosphate Institute
655 Engineering Drive, Suite 110
Norcross, Georgia 30092-2837
Phone (770) 447-0335

Summer 1996, No. 8

SHOULD YOU FERTILIZE DOUBLECROP SOYBEANS?

Each soybean plant functions just like a factory. It requires a minimum of raw materials to generate products, such as grain, at the desired level of yield and quality. Each nutrient...phosphorus, potassium, magnesium, sulfur, boron and others...represents a basic and essential raw material. Few soils are capable of providing these nutrients for an extended period of time without some resupply from fertilizer or other external nutrient sources.

Soils differ in their nutrient storage capacities and their abilities to supply soybean nutrient needs throughout the growing season. Such differences exist in each and every field and they influence the time, rate and method of application of nutrients for highest nutrient use effectiveness.

Soybean nutrient needs are site-specific. The reasons might be due to differences in the soil test level of a nutrient, grain yield goal, grain quality needs, crop nutrient uptake requirements, soil productivity level, rainfall amount and intensity, etc. Each nutrient must become a team player by fulfilling its own functions and then helping other production practices do their best. Optimum soybean yields and profits are most often the product of balanced nutrition in a system of best management practices. The following factors should be considered in the decision to fertilize doublecrop soybeans or to apply soybean nutrient needs to the previous crop, such as wheat.

Proper fertilizer management is essential to soybean production for many reasons. The basic objective is to assure that nutrition is not limiting yield, quality or profit.

-NRU-
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