منابع مشابه
Soil Background Effects on Reflectance-Based Crop Coefficients for Corn
A previously developed reflectance-based crop coeJficient (Kcr) for corn, estimated from the normalized difference vegetation index (ND VI), has been shown to overestimate the basal crop coe~cient (KeQ for corn by 24% or more when used with a dark-colored soil. This overestimation occurs because the NDVI produces larger index values for the same vegetation amount over dark backgrounds. Thus, th...
متن کاملderived crop coefficients for winter wheat using different reference evpotranspiration estimates methods
this paper reports the results of using three empirical methods (makkink, priestley-taylor and hargreaves) for estimating the reference evapotranspiration (et0) in the semi-arid region of tensift al haouz, marrakech (center of morocco). the penman-monteith equation, standardized by the food and agriculture organization (fao-pm), is used to evaluate the three empirical methods. the obtained et0 ...
متن کاملEstimating Crop Residue Decomposition Coefficients Using Substrate-induced Respiration
-hlodeling of crop residue decomposition for nutrient cycling and effectiveness of residues to control soil erosion requires information on crop-specific decomposition coefficients (k). Respiration of decomposing residues reflects the activity of the microbial community and should give an indication of the residue decomposition rate. A method for estimating k using substrate-induced respiration...
متن کاملEstimating Crop Coefficients Using Remote Sensing-Based Vegetation Index
Crop coefficient (Kc)-based estimation of crop evapotranspiration is one of the most commonly used methods for irrigation water management. However, uncertainties of the generalized dual crop coefficient (Kc) method of the Food and Agricultural Organization of the United Nations Irrigation and Drainage Paper No. 56 can contribute to crop evapotranspiration estimates that are substantially diffe...
متن کاملEstimating cotton evapotranspiration crop coefficients with a multispectral vegetation index
Crop coefficients are a widely used and universally accepted method for estimating the crop evapotranspiration (ETc) component in irrigation scheduling programs. However, uncertainties of generalized basal crop coefficient (Kcb) curves can contribute to ETc estimates that are substantially different from actual ETc. Limited research with corn has shown improvements to irrigation scheduling due ...
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ژورنال
عنوان ژورنال: Journal of Range Management
سال: 1990
ISSN: 0022-409X
DOI: 10.2307/4002349