Field management measures of high quality and high yield broccoli

Broccoli is a high-grade health vegetable with all kinds of color, smell and taste, and it is also a best-selling product in the market. However, due to the high requirements for the growth and development of broccoli, and the producers are not familiar with the cultivation techniques of broccoli, it is often due to improper selection of varieties, sowing date and cultivation management measures in production. There are some problems, such as abnormal flower head, leaf hair flower ball, flower head rot, poor quality, low yield and so on, which directly affect the harvest. The field management measures of high yield and high quality broccoli are summarized as follows:

First, the management of slow seedling stage: this period management is mainly cooling and moisturizing, in order to promote early seedling delay. In addition to using a sunshade net to build a shed to cool down the sun, it is also necessary to drench water once in the morning and evening. In order to prevent underground pests from biting off the seedlings, Milol was scattered evenly on the soil surface during planting. About 7 days after planting, human feces and urine or 23% urea aqueous solution were applied thinly to promote plant growth. In order to prevent and reduce the occurrence of diseases, 75% chlorothalonil 600 times or 50% carbendazim 600 times was sprayed once about 10 days after planting.

Second, the management of rosette stage: this period is the peak period of vegetative growth of broccoli, and sufficient fertilizer and water must be provided to make stems and leaves grow faster, so as to lay a good nutritional foundation for high yield. Topdressing was needed twice in this period. When the plant began to grow rapidly (about 15 days after planting), urea was applied with a small hoe in the plant, about 15 kg per mu; the second topdressing was carried out before the plant was sealed. When the heart leaves of the plant began to show a twisted shape (about 30 days after planting), fertilizer was applied in shallow trenches between rows combined with weeding to cultivate the soil, applying compound fertilizer 20kg / mu or peanut bran 25kg / mu. Where there are conditions, it is best to apply human feces and urine every 7 to 10 days. Watering should be sufficient in the early stage of rosette stage to meet the needs of rapid growth and development of plants; when plants grow in clusters, watering should be properly controlled to promote the development of underground roots. The lateral branches occurred in this period should be removed in time to promote the formation of the main bouquet.

Third, heading period management: in order to promote the transformation from vegetative growth to reproductive growth and facilitate the formation of flower heads, it is necessary to properly control nitrogen fertilizer and apply phosphorus, potash fertilizer, boron, molybdenum and other micro-fertilizers. Heavy fertilization was applied once in the initial period of flower head formation (40-50 days after planting), 15 kg of potassium chloride and 15 kg of compound fertilizer per mu. In order to reduce the yellowing of the corm surface and the cavities of the flower stem, and delay the senescence of the plant, the leaf surface was sprayed with 0.5% borax and 0.5% ammonium molybdate solution during the formation of the corm, about once a week, 2 times in a row. During the whole period of flower ball formation, the soil in the field should be kept moist, diseased leaves and old leaves should be removed in time, and diseases and insect pests should be controlled. There are 3 or 4 strong lateral flower branches per plant cultivated in the lateral flower bulb, and the rest of the lateral flower branches should be removed.

Fourth, the management of the harvest period: in this period, we should not only pay attention to the timely removal of diseased leaves and old leaves, so as to facilitate ventilation and light, promote the accumulation of nutrients to the flower bulb, but also pay attention to control moisture to prevent excessive humidity, causing disease and flower ball mildew. In case of acid rain or foggy weather, sprinkle water in time to wash away foggy water and acid rain to reduce flower ball rot. The suitable harvest time of broccoli is short. if the harvest is too late, the flower bulb will be loose, the bud will turn yellow and the quality will decline, but the flower head will be small and the yield will be low if it is harvested too early. Generally, the flower bud particles in the hand feel are loose or the flower bud particles at the edge of the flower ball are slightly loose, the surface of the flower ball is tight and flat, and the harvest time is not concave or convex. Broccoli should be harvested in the early morning or evening on a sunny day. When harvesting, cut the bouquet together with fat and tender stems about 10 centimeters long, put them in a cool place away from light, pack them and list them as soon as possible, and store them at a low temperature quickly if they fail to appear on the market in time. Those cultivated with side heads should also be fertilized once after the main heads are harvested, applying about 15 kg compound fertilizer per mu, and then harvest when the side heads grow to about 5 cm in diameter.