The growth of corn into tasseling and silking is the period during which corn accumulates energy and breeds seeds. It is necessary to strengthen field management and top-dressing watering work. The field management and pest control of corn during this period are described below:
The top-dressing stage is the period in which corn needs the most amount of fertilizer and needs the greatest fertility. The absorption of nitrogen, phosphorus, and potassium accounts for 50% to 55%, 52% to 60%, and 75% of the total absorption of corn. 85%. The large bell-mouth period, which has the highest absorption intensity before and after, yields an area of ​​400 kg of land, applying 75 kg of ammonium per acre or 25 kg of urea, which can be applied once before the big bellmouth period. More than 700 kilograms of output, apply 150 kg of ammonium per acre or 50 kg of urea, apply it in 3 times, combined with irrigation to improve fertilizer efficiency.
Water consumption during the irrigated ear stage is the largest, accounting for 30% to 35% of the total water consumption of a lifetime. It is the critical period for water demand during the tasseling period. It is a critical period of water demand for corn. Drought and water shortage will cause different degrees of production cuts or even no harvest. Severely affecting production, timely irrigation, otherwise, the loss is inestimable.
Strengthening the cultivator and cultivating the soil can improve soil permeability, fertilizer and water supply, promote root development, and remove weeds. Soil cultivation is conducive to aerial root development and effectively prevents lodging.
Prevention and control of pests and diseases should be detected early and early, timely detection of pests and diseases of corn, and consultation with local agricultural technicians or pesticide companies.
The locust is sprayed with 40% omethoate EC 1000 to 1500 times when the average amount of guanidine per 10 corns is 500 or more.
Corn borer is the main pest in the ear stage. Mu 250 g of 3% phoxim granules mixed with 5-6 kg of fine soil, sprinkled in the leaves of corn leaves or leafhoppers, tassel leaves and ear. 600 strains per kilogram of toxic soil can be sprinkled.
When spider mites occurred, they were sprayed 2 to 3 times with 0.2% A. veitchi cream 2500 times or 1.8% zizipan glycogen EC 3000 times.
Large and small leaf spot was sprayed with 50% carbendazim or 50% tetrazine or 70% thiophanate 500-fold spray, spraying once every 5-7 days, and spraying 2 or 3 times.
Rhizoctonia occurs mainly in the late growth period of corn, from grain formation to grain filling. The disease mainly damages leaf sheaths and ear.
Head smut The disease mainly affects the ears and tassels. Most spikes are short, the base is thick and apical, nearly spherical, and does not spit filaments. In addition to the temporal leaves, the whole ear turns into a black powder packet. Later, some pods broke up and black powder was scattered. Black powder is generally bonded into one piece with filaments inside. So called smut.
Stalk rot, also known as stem rot or bacterial wilt, usually begins in the grain-filling stage of maize, and is the peak period from the end of the milk ripening period to the wax ripening period. Stem symptoms begin to develop longitudinally irregular, brownish lesions between the basal stalks, which then soften or harden, and empty within the stem later. The stems were examined and the tissues were rotted. The vascular bundles were filamentous and dissociated. White or pink hyphae were seen. The rots of the stems began to expand upwards from the first quarter and reached the second, third, and even fourth quarters.
The prevention and treatment of common corn diseases should reduce the source of incipient invasion. Should reduce the source of overwhelming bacteria as much as possible; Because the sclerotia in the overwintering field in the field is an important source of infestation of sheath blight, after the corn is harvested, the residues of field diseased plants are completely removed, and the burned and high temperature manure is concentrated to minimize the source of infection. Clean the garden for deep turning, both sterilizing and increasing production. The diseased plants should be promptly eradicated: First, diseased seedlings and suspicious seedlings should be eradicated in time at the seedling stage. The second is the bell-mouthing period. When the symptoms of the diseased and injurious plants are obvious, they are cut off on the spot. The third is the cutting at the latter stage: before the spores of the turf fungus have emerged before they are scattered, they are cut off and buried deep outside the field, and the diseased plants will be removed. Cut it down and put it in the field.
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