The compound fertilizer with different nutrient ratios is treated. The fertilization amount is calculated by applying 500-525 g of pure nitrogen per tree, 3 treatments + 5 k strains of L fertilizer, and the fertilizer time and method are divided into spring fertilizer and summer. Fertilizer (strong fruit fertilizer), autumn fertilizer (take fruit fertilizer), the proportion of fertilization is 30%, 40%, 30%. Spring Fertilizer ~ In the first ten days of March, summer fertilizer is applied during the fruit expansion period, generally in the middle and late May, and autumn fertilizer is generally in late November. The soil nutrient speed meter is used to measure the nutrient in the soil, and the fruit is applied after harvesting. . The fertilization method adopts the annular ditch application, that is, according to the size of the canopy, centering on the trunk, and digging a 20-30 cm deep groove along the outer edge of the canopy drip line, the fertilizer is evenly spread and then reclaimed. The fertilizers applied are mainly the following eight:
(1) No nitrogen fertilizer: no fertilizer is applied.
(2) Farmers are used to fertilizing (N: P205: I (20=15:15:15): Determine the type and amount of fertilizer based on the results of the survey of farmers.
(3) Local recommended fertilization (N: P205: K200015: 15:15) (4) Best fertilization (N: P205: K20 = 20: 10:10 for spring and N: P205: K200016: 8 for summer and autumn:
(4): Add 5 kg/plant of organic fertilizer.
(5) Special fertilizer I (N: P205: K20 = -16:8:16)
(6) Special fertilizer II (N: P205: K20 = 20: 10: 10)
(7) Slow-release fertilizer (N: P205: I (20--20:10:12)
(8) Potassium sulfate type compound fertilizer (N: P205: K20 = 21: 6: 13)
The field management experiment was conducted in 2009~201, and the orangery was not artificially irrigated, all of which were natural rainfall. The citrus cultivation density is 45 plants per mu, the cultivation standard is 3 m X 5 m, and the tree age is 6 years, and no pruning is performed.
The harvested product is harvested and weighed separately for each treatment in the citrus ripening in December each year, while fresh fruit is collected for analysis.
Field survey and analysis test sample collection method: Field growth observation method (including fruit drop and spring shoot survey) In the second fruit drop period of July citrus, the number of fruit and fruit drop of each treated citrus plant was investigated. Slight growth (including branch length and number of leaves) and thousands of weeks of growth. Fruit sample collection Each treatment selects 2-3 strains of citrus to collect the upper, middle, southeast and northwestern fruits before harvesting. Each treatment takes 2kg of fresh fruit. The fruit sample is packed in a clean, vented plastic bag and placed in the label as soon as possible. Send the laboratory for quality analysis and analysis.
Fruit sample analysis method Single fruit heavy pallet balance: According to the method in the construction project of the basic agricultural technology service promotion system , the fruit shape index is measured by vernier caliper (0.1mm); the soluble solids handheld sugar meter method; the total sugar is used in the ketone ratio Color method; titratable acid indicator method; ascorbic acid used 2, 6. Dichlorophenol titration. More instrument information: soil nutrient speed meter http://
Belt: Basic agricultural technology service promotion system construction project http://
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