First, delayed chilling injury: This type of chilling injury has two kinds of situations, one is that the ear is delayed, the flowering period of the ear is at a low temperature, the grouting is impeded, and the yield and quality of rice are affected; the other is that the ear is not delayed, and In the mature period, it encounters cold damage, delays maturity, produces a large amount of green rice, reduces the maturity and 1000-grain weight, and affects the rice rate. The occurrence of delayed chilling injury depends on the monthly average temperature in June and August. If the average temperature in June is lower than 18°C, the average daily temperature in August is lower than 19°C, which is the critical temperature for delayed chilling injury. The main characteristics of delayed chilling injury: First, spikelets at the top of the panicle can be barely inseminated and fertilized, while flowering, insemination, and fruiting of the lower spikelets are all hindered; second, the spikes are slightly sagging, but they are close to the harvesting period with less water and vertical spikes. Up; Third, the childbirth is not normal, stems, leaves and ears are blue, and finally become blue and dry. The main measures for defense against delayed chilling injury are as follows: First, to promote early maturing year-round, to achieve "Autumn Frost Prevention", increase maturity, increase grain weight; second is to use strong anti-stress, medium and early maturity high yield and quality varieties. The third is to adopt greenhouse dry nursery, ultra-deep planting cultivation mode or "three super" cultivation mode to promote the good development of rice root; four is to grab the early grasp, early nursery, early transplanting seedlings, early tiller, promote seedling early growth; Strengthen management, do a good job in weeding, fertilizing, irrigation and pest control. Second, obstacle cold injury: mainly from the spikelet formation period to the heading and flowering period, especially the meiosis period, encountered a short period of abnormally low temperature, so that the differentiation of flower organs is destroyed, pollen abortion, resulting in empty shells, in heading In the flowering stage, when it encounters low temperature, the spikelets do not bloom, the anthers do not crack, and the pollen does not germinate, resulting in a lack of robustness and a significant decrease in yield. This type of chilling injury often occurs in the low temperature years of our province. The average daily temperature during this period is below 17°C, which is the critical temperature for the occurrence of barrier-type cold damage. Disadvantages of chilling injury: First, there are many infertile grains at the top of the ear, and the root of the ear is much stronger. The florets in the upper part of the ear are susceptible to low temperature, and the spikelets at the base of the panicle are directly or indirectly protected due to flooding, and are not affected by low temperature, and the lower branch stems develop vigorously. The second is that infertility (excluding pods) is significantly different between infertile granules and fertile granules; the third is that the solid kernels of the affected panicles are heavier than the ones that are not affected by the solid kernels of the panicle; Normal childbirth before childbirth. The main measures for defense-disabled chilling injury are: select cold-tolerant varieties, take deep-water typhoon irrigation 10-15 days before heading, and maintain 15 cm water layer. At this time, the water temperature is higher than the temperature, so that the panicle differentiated part can be protected from low temperature hazards. Safely through the cold period. In short, irrigation and protection of the child is an effective measure against defensive chilling injury.
Bee Pollen comes from
nature, is the bee from the flowers (nectar plants and pollen plants)
flowers collected in the pollen grains, and joined the special glandular
secretions (nectar and saliva) mixed into an irregular Flat round shape. Bee
pollen has a unique natural health care and medical and cosmetic value,
is more and more people know, is a high-protein low-fat nutritional
health food, known as "all-round nutrition food" "concentrated natural
medicine library" "Oral cosmetics" and so on, is the treasure of human natural food.
We provide rape pollen, tea pollen, sunflower pollen and mixed pollen, they are all collected from our professional green beefarm base.
Bee Pollen Bee Pollen,Bulk Bee Pollen,Natural Bee Pollen,Mixed Bee Pollen Easy Food (Jiaxing) Co., Ltd. , https://www.jxeasyfood.com