Greenhouse Drip Irrigation System Fertigation is using your irrigator to fertilise the plants and soils as you water, which is the most efficient and advanced practice of fertilization. Aid of pressure system (or natural divide terrain), the soluble solid or liquid fertilizer, according to the soil nutrient content and crop fertilizer regularity and characteristics of species, with the fat of with irrigation water, through a controlled water supply pipeline system, supplying, the compatibility, water through the pipe and drop head form drip irrigation, uniform, regular, quantitative, infiltration area crop root growth and development, make the main root soil always stay loose and appropriate moisture content, at the same time according to different crop fertilizer characteristics, environment and soil nutrient content in soil; Crops in different growth phase water requirement, the different development stages of the fertilizer rule is the demand of design, the water and nutrient timing quantitative, provided directly in proportion to the crops. Greenhouse Drip Irrigation System,Greenhouse Micro Irrigation System ,Plant Drip Irrigation JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.alibabagreenhouse.com
(1) The sexual maturation age of salmon is 3 years old and the sexual maturation weight is 0.5-1.0 kg or more. The breeding period is from May to June.
(2) Male and female identification breeding season, sexually mature male pectoral fins in front of the 7 fins and head round white "chasing star", hand touch has a rough sense; abdominal narrow, sexual maturity, light pressure abdominal testicular site, milky white Semen outflow. The females did not have "star-chasing" and the abdomen was obviously enlarged and soft. During the reproductive season, the ventholes were swollen and protruded outward.
(3) Selection and breeding of broodstock The weight of broodstock used for breeding should be 0.5 kg or more, aged 2 to 4 years, and healthy and free from injury. In general, about 1 kg of broodstock is stocked per 100 square meters, with a small amount of grass carp and squid. Carps mainly eat plankton, pay attention to fertilization and maintain water fertility. In spring, green bait can be properly fed, and the daily feed is 6% to 8% of body weight. Starting from March, flush once a month, flushing once a week when spawning.
Catfish artificial propagation technology
1. Broodstock breeding