Cannabinoids from Urtica cannabinoids have tall plants and high grass yield and seed yield. Before flowering, the stems are crisp and leaves are tender, and all kinds of nutrients are rich, so it should be a first-class forage plant. However, because the plants are hairy and the stems and leaves are rich in formic acid, butyric acid and irritating acidic substances, the utilization of livestock and poultry is limited. According to the investigation, pigs and chickens can use nettles with hemp leaves at different growth stages as feed; After turning green in early spring, sheep and cattle seldom eat, but camels are not afraid of stings and are very greedy, and are often poisoned by excessive intake of nettles. If it is not treated in time, it will often die of "swelling"; Horses don't eat at all in early spring. Cattle don't like to eat in summer; But after the flowering period, especially in autumn and winter, horses, cows, sheep, camels and other livestock like to eat. For example, mowing grass in early autumn (flower and fruit period) and drying in the sun to make hay or grass powder can be used as forage or roughage for wintering in spring, which is better for all kinds of livestock and poultry. It is reported that feeding nettles with seeds to chickens in winter can promote egg laying, and the effect of feeding pigs is good, so Yu Shu's statement that "feeding pigs with leaves is easy to grow strong" has been generally confirmed in production practice.

In early spring, camel gluttony with nettles is easy to cause poisoning, while pigs will not be poisoned if they eat a lot. Judging from the long-term utilization of nettles in Xinjiang, except camel poisoning, no other livestock and poultry were poisoned. It is proved that nettle with hemp leaves is a valuable forage grass.

Urtica is a tall plant with high leaf content, and its ratio of stem to leaf is 1∶4.74. Among Urtica plants in China, its productivity is the best. In the natural grassland where nettle with hemp leaves is particularly dominant, the annual hay yield per mu after 1 mowing is 400-600 kg, while under artificial planting conditions, the hay yield per mu after 1 mowing is as high as 996.8 kg. It can be seen that the natural grassland of Urtica cannabinae is not only suitable for grazing, but also suitable for weeding.

Judging from the nutritional content of cannabinoids in nettle (table 1 18), the contents of crude protein, crude fat and crude ash in hay gradually decreased from bud stage to fruit stage, while the contents of crude fiber and nitrogen-free extract increased, but the nutritional content in the same phenological stage was not inferior to that of nettle with narrow leaves and nettle with wide leaves.

Table 1 18 Comparison of chemical constituents of three nettles

In addition, nettle leaves contain 100-340μ g/kg of vitamin C; Its seeds contain 2 1% crude fat. At the same time, its leaves are rich in carotene. According to the analysis data of leaves in bud stage, it is proved that the carotene content in June 15 leaves is100.0μ g/kg; /kg； June 2 1, leaf content as high as 146.7μg/kg. Therefore, the feeding value of nettle cannabinoid is quite high.

Although nettle with hemp leaves stings people, it is still an excellent forage for livestock and poultry because of its high yield and good quality, as long as it is used properly.

According to the physiological characteristics, digestive function and optimum utilization period of different livestock and poultry, it should be adapted to livestock and used in stages: pigs and chickens should use nettle with hemp leaves as feed at each growth stage; Cattle, sheep and camels are suitable for use after flowering; All kinds of livestock and poultry like to eat green hay or grass powder when mowing and drying flowers and fruits, which is used for supplementary feeding in winter and early spring.

The areas where nettles are concentrated are mostly winter and spring grasslands, which are very suitable for livestock grazing. Grazing should be controlled except that camels are prone to poisoning due to their gluttony for young grass. Other kinds of livestock and poultry grazing in autumn, winter and spring have no adverse effects, and are especially suitable for capturing autumn fertilizer.

In early spring, if camels are found to be poisoned by eating too many tender plants, they should be given alkaline drugs and anti-fermentation drugs in time, such as soda water, copper sulfate solution and other drugs that can quickly stop fermentation, supplemented by intestinal moistening agents. After this treatment, the prognosis is generally good.

During the whole growth period, fresh stems, leaves, inflorescences and seeds are collected, cooked or scalded, and bran and concentrated feed are added, which can replace other green coarse feeds to feed pigs and poultry. You can also remove the thick old stems from the green hay, and mix the stems, leaves, inflorescences and seeds, and use them as feed for pigs and poultry; Grass powder can also be mixed with other feeds to make mixed feed, and the feeding effect is better.

Cannabinoids can be propagated by seeds or roots. Under natural conditions, a high-yield semi-artificial grassland can be built as long as the adjacent nettle fields are enclosed and managed slightly. Although there is no precedent of large-scale success in the establishment of artificial mowing land, it has been proved in the plot experiment that the plants were sown in June+10 in 5438, emerged neatly in the following spring, blossomed on August 9, and harvested mature seeds on August 24, and the plants reached 160cm in that year. It can be seen that it is simple and effective to establish artificial mowing land through sowing.

After frosting, the stems and leaves of cannabinoids are dark green, dry, brittle and fragile. Therefore, it is not suitable for artificial harvesting after frost, and it is best to mow it from flowering to fruiting, and it is generally best to harvest it a few days before frost, because at this time, when the seeds are mature, not only hay can be harvested, but also a large number of seeds can be harvested.

When harvesting nettles with hemp leaves manually, you should grasp them from bottom to top along the direction of thorns, or wear protective gloves and long-sleeved isolation gown to avoid touching the thorns. If you are stung, you can immediately use the leaves of plants with high alkali content, such as Chenopodium glaucum and Salsola salsa, or you can use soda water to reduce swelling and relieve pain.

Urtica Cannabis can be used as pasture and Chinese herbal medicine. Urtica Cannabis Decoction is often taken orally and washed externally, or fresh stems and leaves are mashed into straw pulp for external application, which can treat rheumatoid arthritis, postpartum convulsion, infantile convulsion, snake venom, urticaria and so on.

The bark of nettle contains fiber, accounting for 9- 10% of the dry stem, which can be used as industrial raw materials.