Pear tree precise nitrogen applying technique

Abstract

The invention discloses a pear tree precise nitrogen applying technique. The pear tree precise nitrogen applying technique comprises the following steps of measuring visible and near-infrared light spectrums of a leaf on a pear tree by a spectrograph in an in-situ way, picking the leaf, and measuring the content of nitrogen; removing an abnormal sample by a main component analysis method, establishing a correction model by partial least squares regression, and checking by a leave-one-out method crossing verification form, so as to obtain a quantitative correction model; measuring the visible and near-infrared light spectrums of the leaf by the same spectrograph, inputting spectrum values into the established quantitative correction model, and outputting the content of nitrogen; making statistics on the number of tree branches, the average number of leaves of each branch, and the weight of one hundred of leaves, and calculating the fertilizer applying amount in an expanding period according to a formula. The method has the advantages that the content of nitrogen in the leaves of the pear tree can be obtained in a quick, non-loss and low-cost way, and the nitrogenous fertilizer dressing amount in the expanding period is precisely calculated according to the formula, and a scientific basis and a technical approach are provided for the regulation and control on fertilizer applying of the pear tree.

Description

technical field [0001] The invention belongs to the technical field of agricultural cultivation, and in particular relates to a precise nitrogen application technology for pear trees. Background technique [0002] The yield and quality of pears are not only controlled by genetic factors such as varieties, but scientific nitrogen fertilizer planning plays a vital role. In recent years, with the continuous improvement of yield level, the amount of nitrogen fertilizer used in production has also continued to increase. Excessive nitrogen application not only increases production costs, but also leads to a decline in fruit quality and tree disease resistance. Judging the nutritional status of fruit trees through leaf mineral nutrition analysis is an important means to guide fruit tree fertilization. The traditional laboratory-based chemical analysis method of inner leaf nutrition generally requires the destruction of plant samples. It takes a lot of time, manpower and material r...

AI Technical Summary

Problems solved by technology

The traditional laboratory-based chemical analysis method of inner leaf nutrition generally requires the destruction of plant samples. It takes a lot of time, manpower and material resources to collect a large number of samples, dry them, weigh them, grind them, and use potentially harmful drugs for testing. (Wang et al.,2012)

Results are not timely due to taking too long

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