Response of Rice Plants Grown in Three Potted Luzon Soils to Additions of Boron, Sulfur, and Zinc
1972
Lockard, R. G. | Ballaux, J. C. | Liongson, Emma A.
Three low-yielding Luzon soils, Quingua clay loam, Bantog loam, and Umingan loam, on which plants did not respond sufficiently to N, P, or K, were tested in pot studies with three levels of B, S, and Zn in a 3⁴ factorial design to show the response on the yield and nutrient content of rice (Oryza sativa L.). None of the soils was deficient in B, as additions of B resulted in decreased yield and the development of foliar symptoms resembling those of B toxicity. Plants in two soils responded to the addition of S; those in Quingua clay loam gave a greater response than those in Bantog loam. Addition of Zn did not increase the yield of plants in any of the three soils. However, young plants growing in Umingan loam exhibited symptoms resembling those of Zn deficiency in treatment Zn₀. The level of each nutrient in the straw was increased by the addition of that nutrient to the soil. The most pronounced effect was on the S level in the plant when S was applied to the soil. The linear or quadratic equation to calculate this relationship is presented for each nutrient. The highest level of B applied to the soil, treatment B₂, significantly increased the level of S in the straw compared to treatment B₀ but it did not increase yield.
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