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
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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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