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- W2581819639 startingPage "755E" @default.
- W2581819639 abstract "Direct application of fertilizers in irrigation water (fertigation) has been advocated as an efficient method of fertilizing fruit trees. However, more information is needed on the relationship between irrigation and N inputs in order to target fertigation to meet plant demands. Soil solution NO 3 -N concentration was measured at three sites in response to the method of fertilizer application in which 25 g N/tree per year was either spring-broadcast with sprinkler irrigation or fertigated at 8 weekly intervals through drip irrigation; the amount of irrigation water in which 50 g N/tree per year was given in 63 daily fertigations with either 4 or 8 liters of water/day for two soil types and the concentration of fertigated N in which either 75 or 150 ppm NO 3 -N was given in 63 daily fertigations. Soil solution NO 3 -N concentration decreased rapidly for broadcast fertilizer with sprinkler irrigation and was lower than for weekly fertigation with drip irrigation. Doubling the amount of irrigation water effectively halved the soil solution NO 3 -N concentration in both the silt loam and loamy sand soils, although concentrations were higher in the silt loam soil. Movement of applied N below the root zone was halted for the silt loam soil by mid-summer with the lower amount of irrigation water, but was only delayed in the loamy sand soil. Doubling the average concentration of N in the irrigation water resulted in a doubling of the concentration of NO 3 -N in the root zone. A simple model was devised to predict the soil solution NO 3 -N concentration based on N and water inputs and fitted to measured values for daily and weekly fertigation." @default.
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- W2581819639 date "1995-07-01" @default.
- W2581819639 modified "2023-09-23" @default.
- W2581819639 title "Irrigation Management Affects Soil Solution NO3-N Concentration" @default.
- W2581819639 doi "https://doi.org/10.21273/hortsci.30.4.755e" @default.
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