At present, it is a good time to sow spring corn. What needs to be reminded is that during this period of time, the occurrence of herbicides and pests and diseases in spring corn is very serious. The spring corn of Yao Dashu’s family at Liuzhuang Village, Shundian Town, Shengzhou City was unfortunately “invitedâ€.
In Yao’s cornfield, a large number of corn seedlings that are supposed to thrive have been rolled up, and some of them have already fallen onto the soil. Pulling up a more serious inspection, found that in addition to curling of this strain of corn, there are signs of chlorotic chlorosis on the leaves, and the corncob begins to rot. According to the analysis, there are two kinds of these symptoms in maize at this time: First, pests of helminths. It may be time to peel off the new leaves and observe carefully whether there is a Hummer (a tiny horse is only about 1 mm). Control of thrips can use 10% imidacloprid wettable powder 15-20 grams per acre plus 4.5% beta cypermethrin EC 20-30 ml per mu, watered 30 kg conventional spray. For the seedlings rolled into the tail-shaped deformity of cows, a part of the seedlings can be removed from the top to promote the display of the heart.
Second, herbicides cause harm. According to investigations, herbicides that appear to have similar conditions mostly contain methachlor tetrachloride, and dimethyl tetrachlorophosphate must be used when it is used in three or four crops of corn. Later, some phytotoxicity will occur, resulting in leaf curling. The growing point is destroyed. After inspections and conversations, Yao Dashu’s family had a thrips of corn, and he did use dimethyl tetrachlormide herbicide. According to the current seedling age, these corn should have 5 or 6 leaves when herbicides are sprayed. .
Whether it is the thrips damage or the herbicide harm, in addition to the timely fight against drugs, we must pay more attention to the problem of seedlings nutritional supplementation and accelerated recovery. It is recommended that the imidacloprid + brassinolide + potassium dihydrogen phosphate spray program to ease the phytotoxicity and accelerate the growth of diseased seedlings.
Intermediate – Intermediate: A material produced during a drug substance processing step that must undergo further molecular modification or refinement to become a drug substance. Intermediates may or may not be isolated. Intermediates are the key products of the previous process of making APIs, which are different in structure from APIs.
for example:
Amoxicillin capsules are called preparations, amoxicillin is called API, and 6-APA is called intermediate.
Ceftriaxone sodium powder is called preparation, sterile ceftriaxone sodium is called API, and 7-ACA is called intermediate.
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Intermediate is a very important type of fine chemical products. Its essence is a type of "semi-finished product", which is an intermediate product in the production of certain products. For example, if a product is to be produced, it can be produced from intermediates, saving costs and reducing It is widely used in the synthesis of medicines, pesticides, coatings, dyes and spices. In the field of medicine, intermediates are an important link in the industrial chain of the pharmaceutical industry. They are used for some chemical raw materials or chemical products in the process of drug synthesis. In a word, they are used to produce APIs.
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