Study on the use of humus from monosodium glutamate factory for correcting cationic micronutrient deficiencies of crop grown on Takhli soil series.

1992

Jumpen Onthong

Study on a calcareous soil, Takhli series, was incubated with increasing quantities of humus under moist condition at field capacity showed that soil pH was decreased, electrical conductivity of soil was increased and the amount of extractable Fe and Mn determined by using 0.005 M DTPA pH 7.3, 0.1 N HCl and 0.2 M NH4-oxalate were increased. Humus did not affect the quantities of Zn and Cu extracted by these extracting solution. The addition of humus also increased the extractable N (NH4+NO3), P, K, Na and Mg. Application of 0, 7.5, 15, 30 and 45 g/3 kg of this soil and planted to corn for 45 days indicated that only the rates of 7.5 and 15 g were effective in terms of increasing field dried weight and Fe uptake while having no effect with regard to the uptake of Mn and Zn. The Fe uptake of second and third experiment was more than the first. The addition of humus over than 15 g decreased the growth and dry weight of plants for all experiments. The effect of humus and cationic micronutrients on peanut grown on Takhli soil series collected from Tambol Wang Muang showed that this soil was very deficient in Fe. The deficiency symptom of corn can be corrected by Fe-DTPA application but not with humus. Peanut and corn grown on Takhli soil series collected from Tambol Chongsalika did not show cationic micronutrient deficiencies symptom but the concentration and Fe uptake of peanut received Fe-DTPA and humus were higher than control. The split application of the total rates of 10, 20 and 30 g of humus per 5 kg of soil resulted in the higher Fe concentration and uptake of peanut as compared to the single application.

2012/OV/OV2012_3.rdf