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- W1869481337 abstract "Data from soil samples collected from 144 sites in the country were analyzed. The results showed that soil reaction varied from highly acidic to basic. Soil pH not only determines availability of nutrients but also excess of other substances such as sesquioxides, which are detrimental to plant growth under highly acidic soil conditions. Availability of P, for example, is minimized under both acidic and basic soil reactions. Zn deficiency is likely to occur at pH higher than 6.8. However results show that even at pH 6.0 and below there were already 45 sites where Zn was below critical level. This phenomenon can be also true with other nutrients. Only 2 sites were found to have sufficient N, P, K, Zn and S supplies, based on critical levels cited earlier. Majority of the sites (91%) were deficient in 2 or more nutrients. There were only 3 sites found to be limiting in N alone, 1 site each limiting in P and K, and 6 sites in Zn alone. These roughly constitute 8% of the total number of sites sampled. The multiple deficiencies of the samples were higher, ie, 30% of the sites were NPZn-deficient, 24% NPKZn-deficient, and 7% NPKZnS-deficient, comprising 42% of the total number of sites studied. The data shows that the observation that only N is the most limiting nutrient in lowland rice soils is no longer valid. The showed data that 91% of the sites studied showed 2 or more nutrients being limiting. The total area covered by the soil series planted to rice is about 1.2 million hectares. The total area which may be potentially deficient in essential nutrients could further be enlarged with the inclusion of Aklan, the Bicol Region, Cotabato and other rice growing regions not sampled in the present study. Among the soil series, San Manuel is the most widely distributed, and this series had shown multi-nutrient deficiency." @default.
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- W1869481337 date "2003-01-01" @default.
- W1869481337 modified "2023-09-24" @default.
- W1869481337 title "Fertility status of selected rice soils in the Philippines." @default.
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