The color of the stems and leaves of broccoli and the abnormal appearance of flower bulbs are related to improper fertilization. Therefore, it is necessary to improve the techniques of optimizing fertilization. specific methods:
Understand the characteristics of broccoli required for fertilizer. The roots of broccoli are more developed and require the cultivation of soils with rich soil and rich organic matter. It has a large demand for nutrients and most of it is nitrogen and potassium fertilizers. According to the research of the agricultural scientific research department, the production of 1,000 kilograms of flower bulbs requires absorption of 7.7 to 11 kilograms of nitrogen, 2.1 to 3.2 kilograms of phosphorus pentoxide, and 9.2 to 12 kilograms of potassium oxide. The main product organ provided by cauliflower is a white, milky or green flower ball composed of hypertrophic flower buds and flower buds. Therefore, the amount of fertilizer needed in the early period is less, and after flowering, it enters into the growth period of flower buds, and nutrients begin to accumulate in the transport of flower bulbs. Fertilizers are the fastest and must provide sufficient nutrients. In addition to nitrogen, phosphorus and potassium, but also with calcium, boron, magnesium fertilizer.
Apply early basal fertilizer. Since broccoli is a hi-fat vegetable, it should be used in combination with site-building basal fertilizer for about 10 days before planting, and then 1250 kg of manure organic fertilizer or 150-200 kg of commodity organic fertilizer, or bio-organic fertilizer, should be applied per acre. About 75 kg, with a high content of 25 kg of NPK fertilizer, 0.5 kg of borax or 0.4 kg of boron, only full fertilizer can be used to avoid the occurrence of nutrient deficiency.
Due to seedlings for seedlings. Only vegetative bodies with strong growth have broccoli only have a high-yield basis. Therefore, for the normal growth of stems, leaves, and flower bulbs, it is necessary to apply fertilizer in a timely manner. After planting and easing the seedlings, early maturing varieties should chase the cooked human excrement 500 to 750 kilograms. , Or ammonium sulfate 7.5 ~ 20 kilograms, late maturing varieties of chase after maturity of human urine 1500 to 2000 kilograms. In the initial stage of flower bulb formation, urea is applied at 7.5 to 10 kilograms per mus, potassium sulfate is approximately 5 kilograms. Boron-deficient Mg-deficient soil can be sprayed with 0.1%-0.2% borax solution and 0.2%-0.4% magnesium sulfate solution 1-2 times in the initial stage of curd formation. At the same time, it is necessary to carry out furrow irrigation in the dry season sooner or later, so that fertilizer can be adjusted with water.
Sun protection ensures quality. The cauliflower's flower bulb is white and delicate, and the product's consumption rate is high. However, the direct sunlight of the cauliflower may become yellow or greenish purple, affecting the intuitive quality. In field management, bales (such as rice straw) should be used to protect the flower bulbs by covering the top with leaves or leaves to prevent poor quality.
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