Journal article

Publication year: 1978

Pages: 266-283

Journal: Zeitschrift für Acker- und Pflanzenbau

Volume number: 146

Issue number: 4

ISSN: 0044-2151

Publisher: Parey

Abstract: 
In 1973 at 3 locations in the area of Ibadan, Nigeria, field trials were conducted to study the main effect and residual effect of phosphate fertilizer forms having different water solubilities on plants and the soil. With a low phosphate application (45 kg/ha P2O5) the water-soluble phosphates caused both better plant development and higher phosphate uptake at the start of the vegetation period. During later stages, however, the water-soluble phosphates in both respects. At a higher fertilization level (90 kg/ha P2O5) the water-insoluble and combined phosphates were superior to the water-soluble phosphates during the entire vegetation period. The combined phosphates (partly water-soluble and partly water-insoluble) produced the highest maize yield and the greatest phosphate uptake (main effect). All the phosphate forms had a good residual effect on the yield and the phosphate uptake of Vigna unguiculata without any special differences between the phosphate fertilizer forms. The cumulative effect (residual effect plus additional fertilization) when growing V. unguiculata was obviously greater than the pure residual effect of the phosphate fertilizer that had been applied to the maize. The phosphate concentration of the soil solution and the inorganic phosphate fractions (Al-, Fe- and Ca-phosphates) in the soil were increased on all 3 locations by the phosphate fertilizers. The increase in these phosphate fractions measured at the end of the trials indicates that the residual effect of the phosphate fertilization extends over the 1st yr following application. The largest absolute changes among the inorganic phosphate fractions in the soil were found in the Fe-P fraction. This fraction therefore seems to be more involved in the P-dynamics of the soil and the P-supply of the plant than the other inorganic phosphate fractions. The combined phosphates with a water-soluble portion and a water-insoluble portion provide the optimal P-supply for plants on these tropical soils.

Harvard Citation style: ATANASIU, N., WESTPHAL, A. and ZUOFA, K. (1978) FERTILIZATION EFFECT AND RESIDUAL EFFECT OF PHOSPHATES WITH DIFFERING SOLUBILITIES ON TROPICAL AND SUB-TROPICAL SOILS .1. TRIALS ON SOILS IN HUMID TROPICS, ZEITSCHRIFT FUR ACKER UND PFLANZENBAU-JOURNAL OF AGRONOMY AND CROP SCIENCE, 146(4), pp. 266-283

APA Citation style: ATANASIU, N., WESTPHAL, A., & ZUOFA, K. (1978). FERTILIZATION EFFECT AND RESIDUAL EFFECT OF PHOSPHATES WITH DIFFERING SOLUBILITIES ON TROPICAL AND SUB-TROPICAL SOILS .1. TRIALS ON SOILS IN HUMID TROPICS. ZEITSCHRIFT FUR ACKER UND PFLANZENBAU-JOURNAL OF AGRONOMY AND CROP SCIENCE. 146(4), 266-283.