ISHS Acta Horticulturae 696: VII International Symposium on Temperate Zone Fruits in the Tropics and Subtropics - Part Two
RELATIONSHIP BETWEEN P FRACTIONS, SOIL P AVAILABILITY AND GROWTH PARAMETERS OF APPLE FERTILIZED WITH WATER SOLUBLE AND INSOLUBLE SOURCES OF PHOSPHORUS |
| Authors: | S.K. Bhardwaj, A.R. Bhandari, D. Tripathi |
| Keywords: | P-fractions, Olsen&actue;s P, rock phosphate, single superphosphate, apple |
| Abstract:
Field experiments were conducted at two locations to study the transformation of added single superphosphate, rock phosphate alone and in combination with farmyard manure in apple orchards on brown hill acid soils of north west Himalayas. At both locations first year applied rock phosphate (four times the recommended dose) with FYM in general, maintained a relatively higher or statistically equal build up of Al-P and Fe-P in the soil during second and third year as compared to that of annually applied phosphorus through single superphosphate. Rock phosphate alone-based treatments resulted in higher Ca-P fractions in soil as compared to single superphosphate. Residual (RP+FYM) treatments were found to maintain highest saloid-P in the soils. Among the P-fractions, Al–P and Fe–P were found to be positively and significantly correlated with fruit yield, shoot growth, leaf and fruit P content. saloid-P was also found to be significantly correlated with some of the parameters but with lesser degree than Al-P and Fe-P. At Kumarsain, the coefficient of correlation (r) of Al-P and Fe-P with apple yield was to the tune of 0.929,0.915 and 0.907,0.860 during 1993 and 1994, respectively. Similarly, at Sarahan the coefficient of correlation of Al-P and Fe-P with apple yield was 0.907 and 0.835, respectively in the year 1993. Olsen’s P was also found significantly correlated with Al–P and Fe–P fractions as well as with most of the plant growth parameters. Thus, Al-P and Fe-P seems to be the main phosphorus fractions, which govern the availability of phosphorus to apple plants in the region. | |
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