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What are the technical measures for managing summer corn during the flowering and grain-filling stage?
The main goal at this stage is to maintain roots and protect leaves, prevent premature senescence and excessive vegetative growth, extend the functional period of green leaves, prevent grain abortion, and improve seed-setting rate and grain weight. First, apply grain fertilizer skillfully: so-called skillful application should be determined by the appearance of plants in the field. In fields where ear fertilizer is sufficient, plants look good, leaf color
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What to Do When Summer Corn Grows "Cow-Tail Seedlings"
Recently, quite a few farmers brought corn to our station to ask about it. In their corn fields, some corn seedlings had twisted and deformed central leaves that could not unfold, and in severe cases they took on the shape of a large whip, with the tassel unable to emerge normally. Even when ear shoots could form, the kernels were not plump. This phenomenon has also occurred in previous years.
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Key Technical Points for Summer Corn Planting and Field Management
Most summer corn has already entered the jointing stage to the large trumpet stage; therefore, doing a good job of chemical regulation for lodging prevention at the jointing stage, ear fertilizer application, and pest and disease control is crucial for achieving high corn yields. 1. Scientific chemical regulation. Because the wheat growth period was delayed, corn sowing dates were generally later, and the jointing stage coincided with the rainy season, planting hidden risks for corn lodging. Chemical regulation not only makes corn stalks tough, the root system well developed, and lodging resistance stronger, but also deepens leaf color, thickens leaves, increases chlorophyll content, and enhances photosynthesis. It can generally reduce plant height by 10-15 cm and ear height by 10-12 cm, and can also shorten internodes, shaping an ideal high-yield plant form with good ventilation and light penetration. It plays a role in drought resistance, disease resistance, lodging resistance, and promoting reproductive growth, helping to produce large cobs, more kernels, heavier kernels, and a low bare-tip rate. It increases density by 200-400 plants per mu, with a yield increase generally of 15%-30%, truly achieving “seeking high yield within dense planting.” The time for chemical regulation is generally when corn has 6-13 expanded leaves, and the effect is best at 8-13 expanded leaves. Before the 6-leaf stage, corn leaves are slender and the leaf surface is smooth. When corn reaches the 7-expanded-leaf stage, the leaves become broad and thick, and fine soft white hairs appear on the leaf surface that can be easily felt with the back of the hand; this is the best time to spray chemical regulation agents. For the spray agent, the top choice is Dinongbao, the latest research achievement of the Chinese Academy of Agricultural Sciences.</p><p>2. Topdressing ear fertilizer. During the ear stage, the absorption of mineral nutrients is greatest and the absorption intensity is highest; this is the period when corn absorbs nutrients fastest and is also the most important fertilization period in its life. Topdressing nitrogen fertilizer at the large trumpet stage can effectively promote the differentiation of female ear florets and achieve large ears with many kernels. Generally, 20-25 kg of urea or nitrogen-potassium compound fertilizer can be topdressed per mu. The topdressing method can be trenching beside the rows or hole application deep beside the plants, preferably combined with irrigation or applied during effective rainfall. Never broadcast fertilizer on the soil surface to prevent fertilizer loss.</p><p>3. Strengthen pest and disease control. For pests and diseases at the summer corn ear stage, focus on controlling brown spot and corn borer. Brown spot can be controlled by foliar spraying with 12.5% Hexaconazole or 12.5% Triadimefon; corn borer can be controlled at the large trumpet stage by pouring phoxim granules into the whorl or by spraying the heart leaves with 4.5% beta-cypermethrin emulsion or 50% phoxim emulsifiable concentrate. </p>
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What are the field management measures for summer corn in the middle and late stages
1) Timely intertillage and topdressing to meet nutrient needs. During the jointing to small trumpet stage (from 6 leaves unfolded to 10 leaves unfolded), apply fertilizer in combination with intertillage. Through intertillage, destroy wheat stubble, loosen the soil, and control weeds. Topdressing should be mainly nitrogen fertilizer; do not broadcast it on the soil surface. It should be concentrated near the roots
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Key Management Techniques for Summer Soybean in the Mid-to-Late Growth Stage
Compared with corn and cotton, soybean requires less labor, less investment and lower cost during its growth period, which is a major advantage of the summer soybean crop, but for soybean to achieve high yield, mid-to-late stage management is the key. During the flowering and pod-setting stage, vegetative growth and reproductive growth proceed together, which is
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Mid-to-late Season Planting Techniques and Precautions for Summer Corn
What should be paid attention to in the mid-to-late season of summer corn? Here is an introduction. The following points should be noted in the mid-to-late season of summer corn for reference: Fertilization (1) Ear fertilizer. Generally, heavy application of nitrogen fertilizer at the large trumpet stage, accounting for about 50% of the total topdressing amount, with 30-40 kg of standard nitrogen fertilizer applied per mu. (2) Grain fertilizer. Generally accounting for about 10% of the total topdressing amount...
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Replanting summer corn in Northeast China is already too late; is there still time to replant Chinese cabbage now?
Due to the drought in Northeast China this year, corn seedlings in many areas have emerged slowly, and in many areas the corn has even failed to emerge. Of course, some farmers have also been forced to postpone and delay sowing corn because of the drought. For the Northeast region...
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