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Foliar Application of Phosphorus to Spanish Peanuts 1
Author(s) -
Suwanvesh Thienchai,
Morrill L. G.
Publication year - 1986
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1986.00021962007800010012x
Subject(s) - arachis hypogaea , limiting , phosphorus , nutrient , agronomy , chemistry , greenhouse , horticulture , rhizosphere , biology , mechanical engineering , genetics , organic chemistry , bacteria , engineering
The effect of soil P (root P) availability on response of Spanish peanuts ( Arachis hypogaea 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 KH 2 PO 4 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.