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Near infrared spectroscopy combined with chemometrics was investigated to determine the total amino acids (TAA) in oilseed rape leaves. The samples in calibration, validation and prediction set were 80, 40 and 30, respectively. Different spectral preprocessing were compared, and three calibration methods were employed including partial least squares (PLS), multiple linear regression (MLR) and least...
A new acetolactate synthase (ALS)-inhibiting herbicide of pyribambenz-propyl (PP) was applied to oilseed rape leaves with different positions. ALS could reflect the growing states of oilseed rape. Visible and near-infrared (Vis/NIR) spectroscopy was investigated for fast and non-destructive determination of ALS in rapeseed leaves. Partial least squares (PLS) analysis was the calibration method with...
Chlorophyll meter, soil plant analysis development (SPAD) is a simple, portable diagnostic tool that measures the greenness or relative content of leaves. The objective of this study is to analyze the relationships between the chlorophyll meter readings of the functional leaves at different stages and the nitrogen content of the oilseed rape leaves, and analyze the variation laws of the SPAD values...
As a type of nonlinear dynamic parallelism system, artificial neutral network has a capacity of identifying complex causal relationships between variables, such as those between the winter wheat yield and the soil spatial distribution nutrients, including water content, organic matter, total nitrogen, alkali-hydrolysable nitrogen, rapidly available phosphorus and potassium. By training 50 tested soil...
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