Foliar Application of Phosphorus to Spanish Peanuts1
- Thienchai Suwanvesh and
- L. G. Morrill2
The effect of soil P (root P) availability on response of Spanish peanuts (Arachis hypogaa L.) to foliar P applications has not been documented. Greenhouse studies were initiated to investigate the effect of root P on foliar P utilization by Spanish peanuts and determine the effect of an experimental stick-spreader on peanut response to foliar P. Three levels of root P were supplied in a nutrient solution-sand rooting system. Two lines (late and early medium maturing) were used in separate experiments. Growth responses and increases in plant P were obtained when foliar P from KH2P04 was applied with limiting P in the rooting medium. Stick-spreader increased plant P (g kg−1) at 0.5 and 1.0 g L−1 levels but reduced P use at 2.0 g L−1 rate. Dilution effects for N and K were equivalent, concentrations being higher when P was limiting but lower when P was supplied to foliage or roots. Increased total uptake of N and K was observed when foliar or root P was supplied, however. It was concluded that (i) Spanish peanut utilization of foliar P was dependent upon root availability, a significant response being obtained when root P was limiting and (ii) the use of a stick-spreader was beneficial at low application rates but detrimental at high rates.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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