Study on the cause of unfilled pod in groundnut grown on Kula Ronghai soil
1987
Orapin Suriyapan | samnao Phetchawee | Maliwan Teppoonpol (Department of Agriculture, Bangkok (Thailand). Soil Science Div.)
Pod experiment was conducted in 1985 at Bangkhen, Bangkok to examine the cause of unfilled pod in groundnut grown on Kula Ronghai soils. Surface soils at 0-15 cm. depth were taken from a field in Thung Kula Ronghai, Suwanaphum district, Roi-et province for use in this experiment. The soil was an upland soil belonging to the Thatum series and having the following chemical properties: pH=7.4, O.M.=0.87 %, total N=0.044 %, P=28 ppm (Bray- II), K=20 ppm, EC=735 micro mho/cm, CEC=2.8 me/100g, base saturation=30.7 %, Ca-saturation=21.8 % and loamy sand texture. The soils had been used for rice cultivation and had also been fertilized. The treatments consisted of combinations of major, secondary, and micronutrient fertilizers and city compost including the unfertilized control, totalling 12 treatments. These were compared in a completely randomized experiment with three replicates. Response of groundnut to city compost was found to be quite substantial. City compost at a rate of 3 tons/rai (18.75 tons/ha) in combination with NPK fertilizer gave higher numbers of pods, pod and seed yields and total dry matter than other treatments. This treatment gave yield 10 times over the unfertilized treatment and 6 times over the NPK fertilized treatment. It also reduced the percentage of unfilled pods (4.8 % compared to 22-25 % for the NPK and PK treatments). Gypsum in combination with Mg and Mo was found to increase number of pods and pod and seed yields, and also had a low percentage (6.25 %) of unfilled pods. Apart from being low in organic matter, the soils might be deficient in some micronutrients.
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