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Full-Text Articles in Engineering
Yield And Growth Characteristics For Cotton Under Various Irrigation Regimes On Sandy Soil, William R. Detar
Yield And Growth Characteristics For Cotton Under Various Irrigation Regimes On Sandy Soil, William R. Detar
William R DeTar
Over-watering cotton wastes a valuable and scarce resource; it can also lead to rank growth, nutrient leaching, and contaminated groundwater. Since under-watering can decrease yields, the question becomes one of finding the optimum application regime. An irrigation experiment was set up to apply water at six different application rates, ranging from 33% to 144% of normal, with hopes of identifying the regime that produces maximum yield. Two cultivars, Acala Maxxa and Acala PhytoGen-72 (Gossypium hirsutum L.), were planted on sandy soil and irrigated daily with a highly efficient subsurface drip irrigation system for four seasons. The results showed that on …
Detection Of Soil Properties With Airborne Hyperspectral Measurements Of Bare Fields, William R. Detar, J. H. Chesson, J. V. Penner, J. C. Ojala
Detection Of Soil Properties With Airborne Hyperspectral Measurements Of Bare Fields, William R. Detar, J. H. Chesson, J. V. Penner, J. C. Ojala
William R DeTar
ABSTRACT. Remote sensing with aircraft‐based sensors can provide the fine resolution required for site‐specific farming. The within‐field spatial distribution of some soil properties was found by using multiple linear regression to select the best combinations of wave bands, taken from among a full set of 60 narrow bands in the wavelength range of 429 to 1010 nm. The resulting regression equations made it possible to calculate the value of the soil property at every pixel, with a spatial resolution of 1.2 m. Both surface and subsurface samples of soil were taken from the center of each of 321 equal‐sized grids …