Assessing Soil Erosion and Nutrient Losses Under Soil and Water Conservation Measures in Maize Plantation, Khao Suan Kwang District, Khon Kaen Province
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Abstract
A study on assessing erosion and nutrient losses under soil and water conservation measures in maize plantation of Khao Suan Kwang, Khon Kaen. The experiment was randomized complete block design with 4 replications and 7 treatments. The results revealed that among treatments were no significant differences in bulk density and saturated hydraulic conductivity of soils. The application of chemical fertilizer based on soil analysis with soybean, vetiver grass and mycorrhiza treatment was highest available water capacity of soil (14.92%). While the lowest value was obtained from farmer's practice (7.49%). The application of chemical fertilizer based on soil analysis with soybean, vetiver grass and mycorrhiza treatment induced lowest runoff (22.75 m3/rai), sediment (0.15 ton/rai) and nutrient losses (N = 0.011 P = 0.0039 and K = 0.0046 kg/rai). For economic value of soil erosion by water, the farmer's practice treatment had highest costs of erosion based on nutrient losses (21.98 baht/rai/growing season). The application of chemical fertilizer based on soil analysis with soybean, vetiver grass and mycorrhiza treatment gave highest weight of ear (668.42 kg/rai), husks (117.33 kg/rai), cobs (88.89 kg/rai) and grains of maize (579.11 kg/rai). While the farmer practice tended to give the lowest of yield. Additionally, the application of chemical fertilizer based on soil analysis with soybean, vetiver grass and mycorrhiza treatment gave the highest concentration of nitrogen, phosphorus, and potassium in stems (1.83, 0.26 and 0.41%), leaves (1.16, 0.34 and 0.55%), husks (0.55, 0.34 and 0.31%), cobs (0.93, 0.18 and 0.35%) and grains of maize (1.47, 0.84 and 0.33%). Besides, the chemical fertilizer application based on soil analysis with soil and water conservation measures had the effect on increasing of organic matter and plant nutrient availability of the soil with compared to farmer practice. Therefore, maize plantations under soil and water conservation measures are suitable systems which can reduce erosion and also the losses of nutrients by erosion in the upland maize plantation.
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References
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