Why does rapeseed seedlings appear yellow? What are the remedies?
Why do rapeseeds appear yellow? Rapeseed can also be called alfalfa, cold vegetables, broccoli, bitter vegetables, mustard, and scoop. The main types of rapeseed cultivated today are cabbage-type rapeseed, mustard-type rapeseed, and Brassica napus. However, some netizens recently commented that their rapeseed seedlings have appeared yellow, which is why? Next, let's take a look at the causes and remedies for rapeseed seedlings.
First, why does rapeseed seedlings appear yellow?
1. The rapeseed was not ploughed before sowing: the rapeseed seedlings usually need to be ploughed after the second ploughing. The first time after the deep dumping of the large mud, the soil is dried for more than 7 days, and the second time is ploughed at the time of sowing. The soil should be fine and the proper base fertilizer should be applied before the mulling.
2. Before the rapeseed seedlings are planted, they are the broad bean fields, leaving a lot of broad bean residues and germs: because there are many diseases on the broad beans, there are rust, red spot disease, blight, brown spot, root rot, etc. Some of the bacteria that remain in the soil after the beans are harvested will cause damage to the rapeseed seedlings.
3, did not have the control of pests and diseases, increased the occurrence of diseases, so that the oilseed period pests and diseases increased the harm.
Second, rapeseed seedlings yellow remedy measures
1. Many rapeseed field seedlings should regularly clear the ditch and reduce the groundwater level in the rape field to avoid the accumulation of water.
2. Apply foliar fertilizer to rapeseed, use 0.1-0.3% potassium dihydrogen phosphate or phosphorus potassium, spray Shibao, etc. to promote the growth and development of rapeseed roots, so that rapeseed seedlings can resume growth as soon as possible.
3. In the process of planting rapeseed seedlings, it is necessary to increase the application of phosphorus and potassium fertilizer. It is necessary to pay attention to the fact that when the rapeseed seedlings have not recovered from the previous growth state, nitrogen fertilizers such as urea should not be applied, otherwise the condition of rapeseed seedlings will be aggravated.
4. When it is found that yellowing of rapeseed seedlings occurs, it is necessary to check whether it is caused by pests and diseases. Of course, whether it is necessary to do a good job of pest control measures, it is recommended to use 50% carbendazim wettable powder for the disease. 800 times liquid spray; for rapeseed, it is sprayed with 25% pymetrozine wettable powder of 15g + water 30kg per acre.
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