Nitrogen fertilizer real-time recommendation method based on canopy coverage and plant height of facility crops

A technology for real-time recommendation and facility crops, applied in fertilization methods, fertilization devices, complex mathematical operations, etc., can solve the problems of fast variety update cycle and difficult large-scale application, shorten the establishment cycle, improve accuracy, and recommend good nitrogen fertilizers. effect of service

Active Publication Date: 2020-07-17
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the update cycle of facility crop varieties is fast, and the diagnostic models that cost a lot of manpower and financial resources will also face rapid replacement, making it difficult for large-scale application in production

Method used

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  • Nitrogen fertilizer real-time recommendation method based on canopy coverage and plant height of facility crops
  • Nitrogen fertilizer real-time recommendation method based on canopy coverage and plant height of facility crops
  • Nitrogen fertilizer real-time recommendation method based on canopy coverage and plant height of facility crops

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] From December 2017 to February 2018, celery planting experiments with different amounts of chemical fertilizers were carried out in the vegetable planting base of Zhoutie Town, Yixing City, and a plastic greenhouse was selected as the experimental land. Eight treatments with different nitrogen application rates were set, and each treatment was repeated three times, resulting in a total of 24 crop planting plots. Nitrogen fertilizer was applied in three times (the ratio of three applications was 3:4:3), and phosphorus fertilizer and potassium fertilizer were applied as base fertilizers at one time. The treatment settings and fertilizer application rates are shown in Table 1 below. The type of nitrogen fertilizer is urea, the type of phosphate fertilizer is calcium magnesium phosphate fertilizer, and the type of potassium fertilizer is potassium sulfate:

[0047] Table 1 The application amount of nitrogen, phosphorus and potassium fertilizers for each treatment of celery ...

Embodiment 2

[0057] For the same field test in Example 1, the daily average temperature of the celery growth environment was continuously monitored, the effective accumulated temperature was calculated, and according to the preset sampling period of 7 days, at the collection time of each period, the crowns in each celery planting area were collected respectively. Layer coverage and plant height information until harvest;

[0058] Based on the date when the recommended fertilization is ready (45 days after transplanting), calculate the effective accumulated temperature △T after celery transplanting to the base day test (153.6°C), for each planting area except the optimal nitrogen application rate planting area (N4), the cumulative nitrogen application rate before the base day and the cumulative nitrogen application rate corresponding to the optimal nitrogen application rate area were calculated. Subtraction, the value is recorded as △F, and the amount of nitrogen fertilizer applied in each ...

Embodiment 3

[0066] From December 2018 to February 2019, celery was planted in a plastic greenhouse in Zhoutie Town, Yixing City, and the nitrogen fertilization rate for celery was 200kg / hm before transplanting. 2 , according to the ratio of 3:4:3, the nitrogen fertilizer dosage for the three fertilizations is planned to be 60, 80, and 60kg / hm respectively. 2 ; After the celery is transplanted, the daily average temperature of its growth environment is continuously monitored, the effective accumulated temperature is calculated, and the nitrogen nutrition diagnosis and the recommended fertilization amount are calculated before the third fertilization of celery. The nitrogen application rate is 60kg / hm 2 , the effective accumulated temperature of celery obtained on the day of top dressing is (△T test )=176.5 ℃, substitute the critical coverage curve and the critical plant height curve of the celery of Example 1 to obtain C opt =0.57, H opt = 55.01, test the celery canopy coverage C on the...

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Abstract

The invention provides a nitrogen fertilizer real-time recommendation method based on canopy coverage and plant height of facility crops, which belongs to the technical field of agricultural plantingand comprises the following steps: subtracting the nitrogen application amount of an optimal nitrogen application planting area from the nitrogen application amount of a non-optimal nitrogen application planting area, counting as Delta F, and calculating the nitrogen fertilizer recommendation index R of the non-optimal nitrogen application planting area at the same time, performing linear regression analysis on the Delta F values and the corresponding R values of all the non-optimal nitrogen application planting areas to obtain a nitrogen fertilizer recommendation formula; after the crops areplanted, monitoring the daily average temperature of the crop growth environment, calculating the nitrogen fertilizer recommendation index R value of the crops before crop topdressing, and substituting the R value into a nitrogen fertilizer recommendation formula to obtain a corresponding nitrogen fertilizer difference Delta F; and adding the nitrogen fertilizer difference Delta F and the conventional nitrogen application amount of the optimal nitrogen application planting area during topdressing to obtain the real-time recommended amount of the nitrogen fertilizer. According to the method, the problem of inaccurate recommendation caused by relatively large error of a single feature is avoided, and the accuracy of a recommended fertilization result is improved; and the model establishmentperiod is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of agricultural planting, and in particular relates to a method for real-time recommendation of crop nitrogen fertilizer based on canopy coverage and plant height of facility crops. Background technique [0002] Compared with general open-air crops, facility crops have more costs for input management and production materials, and operators also expect higher returns. Survey data and literature data show that the annual nitrogen fertilizer application rate of my country's facility crops can reach up to 1000-2000kg / hm 2 , the amount of nitrogen fertilizer application is large, far exceeding the demand of crops, resulting in extremely low fertilizer utilization rate. At the same time, in the process of planting facilities in successive years, it is easy to cause problems such as soil compaction and salinization, which seriously affects the sustainable development of agriculture. . [0003] In recent years, ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01C21/00G06F17/11
CPCA01C21/005G06F17/11
Inventor 王远施卫明闵炬许纪元武星魁
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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