Corn can receive 100 pounds per mu.
First, look at the characteristics of corn growth and determine the best harvest period for corn.
The maturing stage of corn needs to go through three phases: milk ripening, wax ripening, and ripening. Due to the difference between corn and other crops, the seeds are planted on the ear and are not easy to fall off after ripening, and ripening can be accomplished on the plants. Therefore, the ripening period is the best harvest period for corn.
If the milk ripening period is harvested prematurely, a large amount of nutrients in the plant is being transported and accumulated in the grain, and there is still 45%-70% of the moisture in the grain. At this time, when the harvested corn is drying, it will cost labor hours, and the grain weight after drying will be 1,000. Greatly reduced. According to experiments, harvesting during milk ripening can generally reduce production by 20% to 30%, and the quality is significantly reduced.
If not harvested after the ripening period, the supporting power of the corn stalks is reduced, the plants are easy to fall, and the ear of the lodging is exposed to the ground to cause mildew, and it is also vulnerable to bird pests, causing undue loss of yield and quality.
Whether corn enters the ripening stage, in the normal condition of its plants, can be seen from the appearance characteristics: the middle and lower leaves of the plant turn yellow, the base leaves dry, the yellow leaves of the ear are loose and the grain milk line disappears, the black layer Appears, hardens, and presents the inherent color of the species.
Look at the location of the milk line
The milk line is the dividing line between the corn granule embryo (the so-called corn umbilical, which can be used for oil extraction - corn germ oil) and the endosperm (ie, the main part of the edible corn, rich in starch), the black layer (or black layer) ) is the dividing line between corn kernels and cobs. When the black layer of corn grains began to appear and gradually deepen, it showed that the corn tends to mature.
The order of corn grain filling is: the middle of the ear is faster than the lower part, and the lower part is faster than the upper part. Seen from one grain: starting from the top of the grain to the base. In the process of grouting and enrichment, from the back of the grain embryo, the color from the top to the base of the grain can be seen from the deep line, and there is a clear boundary line, called the milk line.
It was observed and determined that when the milk line was at the top third position, the weight of one thousand grains was 299 grams, which was 90.9% of the grain weight at maturity; when the milk line was at one half of grain, the grain weight was 323 grams. This is equivalent to 98.9% of the mature time; when the milk line is at the base and disappears, the 1,000-grain weight is 329 grams, which is the maximum.
Second look at the number of green leaves
According to investigations, when the yellow leaves of the ear of the fruit are harvested, there are still 7-8 green leaves in the upper part of the plant. The 1000-grain weight is 318 grams, which is equivalent to 92.9% of the grain weight at maturity; when the ear is yellow, the plant has 5 pieces. When left and right leaves were harvested, the weight of one thousand grains was 333 grams, which was 98.8% of the grain weight at maturity; when the leaves of the ear were yellow and loose, the plants only had 1-2 pieces of green leaves when they were harvested, and the highest grain weight was 345 grams.
Look at the grouting time
The results from the staged harvest of corn show that: 50 days after pollination, the maximum grain weight was 344 grams; at 45 days after pollination, the grain weight was 336.9 grams, equivalent to 98.8% at maturity; 40 days after pollination, the grain weight was 313 grams, equivalent At 90.9% of maturity, after 50 days of pollination, grain weight began to decline due to respiration. After 55 days of pollination, the 1,000-grain weight was 336 grams, a decrease of 1.8%.
From the “Three Looks†of corn growth characteristics, it is known that after 45-50 days after pollination, the grain milk line starts to disappear, yellow leaves of the ear are loose and loose, and when the plant’s green leaves are no more than five, harvesting corn is the most appropriate. It is the best harvest period for corn, with high yield, good quality, and high efficiency.
Second, calculate the time to determine the corn harvest period.
Under normal circumstances, it is advisable to harvest the corn for an extension period of about 10 days. For example, Zhengdan 958 has a growth period of 96 days. It can start normal seeding and the soil can normally grow and grow for about 10 days, and harvest about 106 days. If the sowing time is June 1, it can be harvested around September 17.
Because the moisture content of late harvest corn is generally around 30%-40%, you can hear the weather forecast, dry in sunny weather, when the water content is 20%-30%, timely threshing drying, drying to corn moisture content in 14 % is appropriate below.
The best time to harvest corn
Generally from August to October, it is inconsistent throughout the country. Maize planting is divided into spring sowing and summer sowing. The north is mainly spring sowing. The main refers to the north of Liaoning, Jilin, Heilongjiang and Hebei. The other places are basically sowed in summer as well as spring sowing. The northern corn ripening period is generally from September 15 to September 23. On the day, the south is mostly after mid-October.
Hebei corn harvest time
Summer sowing in Hebei Province is generally mature from late September to mid-October. Spring sowing is generally from early September to mid-September.
Henan corn harvest time
The suitable sowing period in northern Henan and western Henan is suitable from October 4th to 13th, and partial sowing in hilly areas is appropriate in early October.
The suitable sowing period in Henan and Henan provinces is from October 8th to 17th; the suitable sowing period in southwest Henan province is from October 15th to 23rd;
The suitable sowing period in southern Henan is from October 17th to 26th.
Shandong corn harvest time
Because of the early sowing time and the long growth period of spring maize in Shandong, the yield is high. Spring maize is generally planted in early April in Shandong and harvested at the end of August.
Heilongjiang corn harvest time
The maturity period of ordinary corn in Heilongjiang is generally around October 1 of each year (or the Mid-Autumn Festival, that is, August 15th of the lunar calendar).
You can't ignore this after harvest!
First, threshing corn, seize the time for drying, when the storage, corn moisture content must be within 14?.
Second, after the harvest of the ear, it is necessary to peel off the shell in time, dry it in time, and dry it in the place where the sun shines. It is often turned over. Do not cause the corn to be rotten and moldy due to busy farming.
Third, do not burn the corn stalks at will. The corn stalks can be used as green feed or straw to improve the soil.
The fourth is to remove impurities. After drying, the corn should be stored in a well-ventilated and dry place. Attention should be paid to rodents, mildew-proof and insect-proof.
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