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Quantity and intensity relationships in predicting P availability of soils in Sri Lanka
Author(s) -
Kumaragamage Darshani,
Keerthisinghe Gamini
Publication year - 1988
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19881510609
Subject(s) - brassica , intensity (physics) , sri lanka , soil water , linear regression , seedling , light intensity , regression analysis , zoology , chemistry , horticulture , mathematics , biology , environmental science , statistics , ecology , physics , environmental planning , quantum mechanics , optics , tanzania
In a greenhouse experiment, P uptake by rye grass ( Lolium multiflorium L.), from four representative soils of Sri Lanka were found to be signifikantly correlated with P intensity (r = 0.65**) and quantity (r = 0.68**) measurements. The incorporation of maximum buffer capacity (MBC) values in multiple regression improved the relationship of P uptake with P quantity but not with P intensity. Multiple regression equation indicated that at equal quantity levels, increasing buffer capacity tends to increase P uptake, indicating that the quantity parameter was buffered by MBC. A seedling experiment of 14 days duration using mustard ( Brassica juncea L.) seedlings illustrated that P intensity had a more pronounced effect on P uptake (r = 0.80***) than P quantity (r = 0.43*). The incorporation of MBC values improved the relationship between P quantity and P uptake, but unlike the previous experiment the multiple regression equation indicated a negative relationship between MBC and P uptake at equal quantity levels confirming the importance of P intensity when P uptake is considered for a shot period.