ISSN:
1573-5036
Keywords:
Electro-ultrafiltration
;
Exchangeable K
;
Grain yield
;
K soil testing
;
Wetland rice
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Potassium in wetland rice soils from five different locations in the Philippines was analyzed using the electroultrafiltration (EUF) technique and by extraction withN NH4 acetate (pH 7). The soils contained low exchangeable K and responded to K application. The K soil test values were calibrated against the rice response to K application under field conditions. EUF extractable soil K correlated highly significantly with the rice yield response to K fertilizer, whereas the NH4 acetate extractable K (exchangeable K) did not. Under limiting K supply in soils, rice yield depends more on the EUF-K than on the exchangeable K. Maximum grain yields were obtained when the EUF-K values after harvest and before wetland preparation were above 30 ppm K.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02183589
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