Preparation method for nitrogen fertilizer management leaf color chart of flue-cured tobacco
A technology for flue-cured tobacco and tobacco leaves, which is applied in the field of preparation of flue-cured tobacco nitrogen fertilizer management leaf color cards, which can solve the problems of not being able to track fertilizer needs at any time, lack of timeliness, and not yet appearing, and achieve fast and reliable measurement, low cost, and improve nitrogen fertilizer utilization. Effect
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Embodiment 1
[0015] Example 1: Combining figure 1 , a preparation method of flue-cured tobacco nitrogen fertilizer management leaf color card of the present invention, the steps are as follows:
[0016] Step 1: Sampling: Randomly select 10-20 flue-cured tobacco plants in different nitrogen application areas 30-60 days after transplanting, and pick the fifth leaf from the bottom at the same time;
[0017] Step 2: Extract the RGB value of the tobacco leaf image: use a high-resolution scanner to scan the picked fresh tobacco leaves in step 1, the image resolution is 2550 × 3504 pixels, and store in JPG format; use Adobe Photoshop 7.0 or above graphics software The histogram program reads the image mean value of each channel of red, green, and blue, where red, green, and blue are represented by R, G, and B respectively;
[0018] Step 3: Yield measurement: pick mature leaves and bake them in different periods, and measure the yield of tobacco leaves in planting areas with different nitrogen ap...
Embodiment 2
[0030] Embodiment 2: In 2009, experiments were carried out at Heilongjiang Institute of Tobacco Science Research Institute (Ning'an City), and its soil basic fertility soil organic matter was 23.0g kg -1 , Alkaline hydrolyzed nitrogen 105.6mg·kg -1 , available phosphorus 43.70mg·kg -1 , available potassium 240.0mg·kg -1 . The variety of flue-cured tobacco is Longyan 911. Guaranteed Phosphorus and Potassium (70kg·hm -2 P 2 o 5 , 145kg·hm -2 K 2 O) under fixed conditions, set the following 6 nitrogen fertilizer treatments, see Table 1. The tested fertilizers were ammonium nitrate (35% N), heavy calcium (46% P 2 o 5 ) and potassium sulfate (54% K 2 O). Phosphate fertilizer and potassium fertilizer base application, nitrogen fertilizer base application and topdressing (1:1). The distance between plants is 0.5m, the distance between rows is 1.1m, the ridge length is 6m, and the area of the plot (6 ridges×1.1m width×6m ridge length) is 39.6m 2 , repeated 3 times.
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Embodiment 3
[0051] Embodiment 3: In 2010, test was done at Heilongjiang Provincial Institute of Tobacco Science Research Institute (Ning'an City), and its soil basic fertility soil organic matter was 26.2g kg -1 , Alkaline hydrolyzed nitrogen 116.6mg·kg -1 , available phosphorus 54.25mg·kg -1 , available potassium 258.37mg·kg -1 . Experimental design: flue-cured tobacco variety, Longyan 911. Guaranteed Phosphorus and Potassium (70kg·hm -2 P 2 o 5 , 145kg·hm -2 K 2 O) Under fixed conditions, set the following 6 nitrogen fertilizer treatments (52.5kg·hm -2 N, 55kg·hm -2 N, 57.5kg·hm -2 N, 60kg·hm -2 N, 62.5kg·hm -2 N, 65kg·hm -2 N). The tested fertilizers were ammonium nitrate (35% N), heavy calcium (46% P 2 o 5 ) and potassium sulfate (54% K 2 O). Phosphate fertilizer and potassium fertilizer base application, nitrogen fertilizer base application and topdressing (1:1). The distance between plants is 0.5m, the distance between rows is 1.1m, the ridge length is 6m, and the...
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