I. Arrangement of mouthwash At present, there are several modes of mouthwash arrangement for the use of grass forage: In the annual variety arrangement, ryegrass + sudangrass + ryegrass, or ryegrass + mexican corn + ryegrass are used. In the arrangement of planting area, it is determined by estimating the amount of forage grass and stocks of herbivorous fish, but the ratio of planting area to water surface is generally set at 0.2 to 0.3:1.
For areas with low planting levels and low yields, the area of ​​forage grasses can be slightly increased. In the arrangement of proportions of various species, the number of old and grazing species of herbivorous fishes is mainly determined. If there are more species of old fish, the area of ​​ryegrass (autumn sowing) is slightly larger than that of Sudan grass and other spring sowing species. On the contrary, the area of ​​spring sown varieties with more larvae should be larger than that of autumn sowing varieties. In this way, the yield of pasture can be adapted to the feeding capacity and food intake of herbivorous fish.
Second, sowing cultivation of Sudan grass generally from February to March began sowing, per acre sowing seeds 2.5 kg, using on-demand, drill can be. Seedling transplanting seedlings is more than twice as productive as on-demand seedlings. On-demand 10 seeds per hole, 18cm to 25cm from the hole, ditch depth 1cm to 2cm, spacing 18cm to 25cm. When the grass grows to 4 seedlings, transplanting begins. The spacing of the plants is 6 cm 6 cm, and 4 to 6 roots per plant. 100 kg of manure can be sprayed per acre after sowing. Harvesting starts in May. For each harvest, 200 kg to 250 kg of manure is applied per acre. It can be harvested 8 times to 10 times a year, and the annual output is 7500 kg to 8000 kg. Ryegrass was planted in early September after the beginning of autumn and 1 kg of seed was sown per acre. Can drill, ditch depth 2 cm to 3 cm, spacing 20 cm evenly sowing, covered with thin soil. When the seedlings grow to 4 pieces and begin transplanting, the spacing is 6 cm to 7 cm, 7 to 8 per plant. The ryegrass began to be harvested in October. After each harvest, 300 kg to 400 kg of manure per mu, or 5 kg to 10 kg of urea, can be harvested for 8 to 10 times. The yield of fresh grass per mu can reach 7500 kg to 8000. More than kilograms. Some species, such as Mexican corn and other seeds, are suitable for large-scale on-demand methods and will be gradually deleted after emergence. It is best not to use transplanting method, because the seedlings turn green after transplanting for a long time, if the weather is not normal will reduce the survival rate of seedlings, resulting in lack of seedlings. In order to advance the sowing and transplanting time, it is also possible to adopt the thin film seedling seedling transplanting method commonly used in vegetable planting. In short, when using different methods of sowing and planting, it is necessary to determine a more appropriate method based on the different characteristics of pasture varieties and their own techniques.
Third, the purpose of harvesting and utilization of planting fish forage is to use its stems and leaves to feed fish, must be timely and reasonable use of green cut. Therefore, in harvesting and utilization, it is necessary to take into account both the yield and the availability of loquat leaf, not only to prevent cutting green too early, and to reduce the output too frequently, but also to pay attention to the fact that the plants are too tall for the sake of high yield, and the stems and leaves are aged and not easily affected by fish. use. Different varieties, the harvest height is different, such as the first harvest time of ryegrass at the height of not more than 50 cm is appropriate, after the harvest height is controlled at about 70 cm. Sudan grass and Mexican corn are used at the height of 60 cm for the first time, and should not exceed 1 m afterwards. Some other species, such as Xiaomicao, bitter leeks, migratory quail, pennisetum, etc., must also master this principle in harvesting and utilization. In general, high stalked forage (such as dwarf grass, royal grass, elephant grass, etc.) plant height of not less than 100 cm in order to cut blue use. The coverage of forage grass cover is generally up to 90%, and it is not allowed to cut off the stem branch that has been taken into the soil. Some species cannot be harvested on rainy days to prevent rain from entering stems, causing rotted roots such as sudan grass. At the time of harvesting, all varieties are required to have a few centimeters of cornice height in order to facilitate regeneration and timely harvesting after harvest. Second, it is forbidden to cut green with a rusty tool. Rust disease is often caused by the use of rusty tools in the feed. Third, feed input should be scientific. Feeding grass should be done regularly, qualitatively, and quantitatively. The number and quality of feed should be determined according to the size and quantity of fish.
Fourth, the method of increasing the yield of fishery forage In general, for fishery forage, all kinds of chemical fertilizers and manure dung can be topdressing, but the most sensitive to nitrogen fertilizer, more nitrogen fertilizer, yield can be turned several times. In addition, according to the results of many years of experiments, the use of high-grass forage and alfalfa forage for intercropping, the amount of grass production than the single species of grass to increase 20% to 30%.
For areas with low planting levels and low yields, the area of ​​forage grasses can be slightly increased. In the arrangement of proportions of various species, the number of old and grazing species of herbivorous fishes is mainly determined. If there are more species of old fish, the area of ​​ryegrass (autumn sowing) is slightly larger than that of Sudan grass and other spring sowing species. On the contrary, the area of ​​spring sown varieties with more larvae should be larger than that of autumn sowing varieties. In this way, the yield of pasture can be adapted to the feeding capacity and food intake of herbivorous fish.
Second, sowing cultivation of Sudan grass generally from February to March began sowing, per acre sowing seeds 2.5 kg, using on-demand, drill can be. Seedling transplanting seedlings is more than twice as productive as on-demand seedlings. On-demand 10 seeds per hole, 18cm to 25cm from the hole, ditch depth 1cm to 2cm, spacing 18cm to 25cm. When the grass grows to 4 seedlings, transplanting begins. The spacing of the plants is 6 cm 6 cm, and 4 to 6 roots per plant. 100 kg of manure can be sprayed per acre after sowing. Harvesting starts in May. For each harvest, 200 kg to 250 kg of manure is applied per acre. It can be harvested 8 times to 10 times a year, and the annual output is 7500 kg to 8000 kg. Ryegrass was planted in early September after the beginning of autumn and 1 kg of seed was sown per acre. Can drill, ditch depth 2 cm to 3 cm, spacing 20 cm evenly sowing, covered with thin soil. When the seedlings grow to 4 pieces and begin transplanting, the spacing is 6 cm to 7 cm, 7 to 8 per plant. The ryegrass began to be harvested in October. After each harvest, 300 kg to 400 kg of manure per mu, or 5 kg to 10 kg of urea, can be harvested for 8 to 10 times. The yield of fresh grass per mu can reach 7500 kg to 8000. More than kilograms. Some species, such as Mexican corn and other seeds, are suitable for large-scale on-demand methods and will be gradually deleted after emergence. It is best not to use transplanting method, because the seedlings turn green after transplanting for a long time, if the weather is not normal will reduce the survival rate of seedlings, resulting in lack of seedlings. In order to advance the sowing and transplanting time, it is also possible to adopt the thin film seedling seedling transplanting method commonly used in vegetable planting. In short, when using different methods of sowing and planting, it is necessary to determine a more appropriate method based on the different characteristics of pasture varieties and their own techniques.
Third, the purpose of harvesting and utilization of planting fish forage is to use its stems and leaves to feed fish, must be timely and reasonable use of green cut. Therefore, in harvesting and utilization, it is necessary to take into account both the yield and the availability of loquat leaf, not only to prevent cutting green too early, and to reduce the output too frequently, but also to pay attention to the fact that the plants are too tall for the sake of high yield, and the stems and leaves are aged and not easily affected by fish. use. Different varieties, the harvest height is different, such as the first harvest time of ryegrass at the height of not more than 50 cm is appropriate, after the harvest height is controlled at about 70 cm. Sudan grass and Mexican corn are used at the height of 60 cm for the first time, and should not exceed 1 m afterwards. Some other species, such as Xiaomicao, bitter leeks, migratory quail, pennisetum, etc., must also master this principle in harvesting and utilization. In general, high stalked forage (such as dwarf grass, royal grass, elephant grass, etc.) plant height of not less than 100 cm in order to cut blue use. The coverage of forage grass cover is generally up to 90%, and it is not allowed to cut off the stem branch that has been taken into the soil. Some species cannot be harvested on rainy days to prevent rain from entering stems, causing rotted roots such as sudan grass. At the time of harvesting, all varieties are required to have a few centimeters of cornice height in order to facilitate regeneration and timely harvesting after harvest. Second, it is forbidden to cut green with a rusty tool. Rust disease is often caused by the use of rusty tools in the feed. Third, feed input should be scientific. Feeding grass should be done regularly, qualitatively, and quantitatively. The number and quality of feed should be determined according to the size and quantity of fish.
Fourth, the method of increasing the yield of fishery forage In general, for fishery forage, all kinds of chemical fertilizers and manure dung can be topdressing, but the most sensitive to nitrogen fertilizer, more nitrogen fertilizer, yield can be turned several times. In addition, according to the results of many years of experiments, the use of high-grass forage and alfalfa forage for intercropping, the amount of grass production than the single species of grass to increase 20% to 30%.
1000Hz High Frequency LiDAR System
JRT High Frequency Range LiDAR Sensor is 2021 new product, that's a low-cost tof sensor but High frequency (up to 1000Hz). With 5cm high accuracy, the LiDAR Module can measure 80m.
Why the 1000Hz High Frequency LiDAR System:
* Widely used in many industrial automation system, like, UAV, delivery van, anti-lock break system, construction automation,intelligent toy robots etc.
* Small size: 43*35*21mm, can be easily integrated
* Invisible laser design: the laser type is 905nm,Class I
* High Frequency: 1000hz/1khz
* Low power design
Chengdu JRT Main Ranging Modules: Industrial Laser Distance Sensor, Laser Distance Meter Module, Tof LiDAR Sensor.
Chengdu JRT Meter Technology Co., Ltd , https://www.cdlaserdistancesensor.com