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정강호,손연규,장용선,한경화 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.1
This research was performed to test the hypothesis that the optimal fertilization rate for lettuce is various with soil moisture conditions. The experiment was conducted under a rainfall-intercepted facility in Suwon, South Korea from 2002 to 2003. Soil was irrigated at 30, 50, or 80 kPa of soil moisture tension at 15 cm soil depth in 2002 spring and fall and 20, 30, 50, or 80 kPa in 2003 spring. Fertilization was performed with four levels in spring for both years: none, 0.5, 1.0, and 1.5 times of the recommended N, P, and K fertilization rate. The irrigation amount increased with decreased irrigation starting point as soil moisture tension. The maximum yield was found at the lowest soil moisture tension in spring while irrigation at 50 kPa resulted in the greatest yield in fall. The yield responses of lettuce to fertilization rates were various with soil moisture condition. In spring, maximum yield was found at 1.0 or 1.5 times of the recommended fertilization rate at 20, 30, and 50 kPa irrigation while 0.5 or 1.0 times of fertilization rate resulted in the maximum yield in fall. Especially for 80 kPa irrigation in 2003 spring, yield was decreased by fertilization. It suggested that the optimum fertilization rate for lettuce is affected by soil moisture condition and that lower fertilization rate should be suggested when soil is managed in drier condition.
정강호,이광승,오양열,이충근 한국토양비료학회 2022 한국토양비료학회지 Vol.55 No.4
The Korean government has performed the international cooperation project to develop rice cultivationmethods under desert climate and alkaline sandy soils with the UAE government. Rice can be cultivated inalkaline sandy soil with paddy condition while it demands too much water. Four treatments were tested underprotected plastic house: paddy cultivation with an impermeable layer (PP), furrow cultivation (F), furrowcultivation with an impermeable layer (FP), and furrow cultivation with clay dressing (FB). The impermeablelayer prohibited percolation. Furrow cultivation reduced evaporation by irrigation only in the furrow. Claydressing extend flooding periods to decline infiltration rates. Daily water consumption rates were 5.4 to 5.5mm in furrow cultivation accounting for 57% of that in PP. The number of tiller was 16.0 in PP flooding allthe time while they ranged from 4.4 to 6.8 in furrow cultivation treatments. The productivity in FP and FBwere 84.1% and 78.9% out of that in PP. The water use efficiency in FP and FB, therefore, leached 1.4 to 1.5times of that in PP. Based on the water use efficiency, FP and FB were proposed the applicable practices forreasonable productivity and water consumption. Furthermore, FP and FB have potential to raise productivityby increasing seeding rates considering low tillering rates.
Responses of Capsicum annum (red pepper) to Fertilization Rates at Various Soil Moisture Conditions
정강호,손연규,한경화,장용선 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.5
This research was performed to test the hypothesis that the optimal fertilization rate for red pepper is changedby soil moisture condition. The experiment was conducted in rainfall-intercepted fields in Suwon, SouthKorea from 2002 to 2003. Soil was irrigated at 30, 50, or 80 kPa of soil moisture tension at 20 cm soil depthin 2002 and 30, 50, 100, or 150 kPa in 2003. For both years, fertilization was performed with four levels: none,0.5, 1, and 1.5 times of the recommended N, P, and K fertilization rate. The irrigation amount was the greatestat 30 kPa irrigation while the water use efficiency increased with decrease of irrigation amount. The Irrigationamount was 508 mm at 30 kPa irrigation and ranged from 355 mm to 435 mm at 50 kPa irrigation. Themaximum yield was found at 30 kPa irrigation and 1.5 times of the recommend fertilization rate in 2002 and2003. The yield index of red pepper increased linearly with the fertilization rate at 30 kPa which implied thatexcess irrigation induced nutrient leaching and reduced nutrient availability. The maximum yield in 50 kPaand 80 kPa was found at the recommend fertilization rate while the yield decreased by fertilization at 100 kPaand 150 kPa irrigation. It implies that reduction of fertilization is the feasible practice to mitigate drought stressin fields without stable irrigation resources.