Effect of lime and some nutrient elements on yields of peanut grown on a Khok Khian paddy soil
1990
Sumali Suthipradit (Prince of Songkhla Univ., Songkhla (Thailand). Faculty of Natural Resources. Dept. of Earth Science) | Paisan Laosuwan | Thiraphong Juntaraniyom
Two peanut plants were grown per pot in three kg of surface, 0-15 cm Khok Khian soil series (Ko) receiving four lime rates, 0, 625, 1,250 and 2,500 Kg/ha, respectively, as the main plot. The sub-plot was essential nutrient elements (N, P, K, Mg, Zn, B, Cu, Mo and Co). The experiment was conducted as an omission trial. The treatments of no nutrient application (-AII) and with all nutrient applied (+AII) were included for comparisons. Lime was thoroughly mixed with the soil mass and left incubated for two weeks at 80% field capacity prior to nutrient application. Inoculated seeds of peanut cv. Tainan 9 were planted to each pot. After sowing each pot was received deionized water at 100 % field capacity throughout the experiment. Results demonstrated that increase in the rate of lime application significantly increased biomass (shoot + root) dry weight, pod number and pod dry weight per plant of peanut. These maximum yields were obtained at 2,500 kg/ha of lime. However, the maximum yield was obtained only when phosphorus and potassium were applied, indicating that these two elements existed in the soil were inadequate for the growth of peanut. Nevertheless, no clear foliar symptoms of potassium deficiency were observed on the plant grown in -K treatment while plants grown on -P treatment manifesting symptoms resemble phosphorus deficiency. In addition, plants grown on -P treatment also showed symptoms of nitrogen deficiency at the latter growth stage; this result suggested that phosphorus may have influenced in nitrogen fixation processes. Moreover, such a high lime requirement (2,500 Kg/ha) for maximum growth of peanut grown in this acid soil could perhaps due to the need to alleviate aluminium toxicity rather than to increase the amount of calcium supply
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