Effect of soil moisture on nodulation nitrogen fixation and growth of groundnut
1989
Voravit Roongkasin | Montien Somabhi (Khon Kaen Field Crops Research Center, Khon Kaen (Thailand)) | Okabe, Takashi
Study was conducted in the greenhouse at the Agricultural Development Research Center in Northeast Thailand to determine the effect of limited water condition on growth and nitrogen fixation of groundnut. The experiment was conducted by planting groundnut in clay pipes, 20 cm. diameter, filled with loamy sand soil. The pipes were placed in water pans, supplying water to the groundnut plants. Different soil moisture regimes were created by using pipes with four different heights (50, 75, 100 and 125 cm.) These were arranged in a randomized complete block design with 6 replicates. Groundnut cultivar Tainan 9 was used. Seeds were inoculated with rhizobium at planting. At 55 and 65 days after emergence, soil samples were taken for soil moisture determination. Measurements were also made on plant height, number of nodules, nodule dry weight and nitrogen fixation (as determined by acetylene reduction). Soil moisture content and available soil moisture varied corresponding to the height of the pipe, the shorter the pipe the higher moisture content and availability. Growth, nodule number and nitrogen fixation of groundnut plants grown in pipes of different heights also varied corresponding to the level of moisture content and availability. Limited soil moisture suppressed growth and nitrogen fixation of the groundnut crop.
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