Nutrient Assessment with Omission Pot Trials for Management of Rubber Growing Soil

Pramoth Timkhum, Somsak Maneepong, Montree Issarakrisila and Krissada Sangsing

Journal of Agricultural Science, 2013, vol. 5, issue 10, 10

Abstract: Rubber-growing soils in southern Thailand are usually deficient in both macro- and micronutrients. Omission pot trial is an excellent tool for nutrient assessment because it can indicate the most limiting nutrient and the order of limitation. Maize is generally used as a test plant, but the difference in nutrient response of maize and rubber is not clearly understood. An omission pot trial with 10 treatments (All, -N, -P, -K, -Mg, -S, -Zn, -Cu, -B, and -Lime) was conducted. The soil samples were limed with Ca(OH)2 to pH 6, except for that used for the -Lime treatment. Equivalent amounts of 400 kg ha-1 of N, 120 of P, 175 of K, 75 of Mg, 100 of S, 6 of Zn, 4 of Cu and 2 kg ha-1 of B, were added in the All treatment. Nutrient X was omitted in the -X treatment. Maize and rubber were grown as test plants. The plant growth indices were measured after 30 days for maize and after 9 months for rubber. The limiting nutrients of both plants were N, P, and Ca (lime). Rubber growth in the field, which received government-recommended and omission-based fertilization, were not different.

Date: 2013
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