How do you determine how much a crop is sown? Which crop is sown more widely?

The economic significance of each parameter to be estimated in the error correction model is as follows: the short-term output elasticity of sown area to yield; : the short-term yield elasticity of fertilizer application rate on yield; : The degree of deviation from the long-term equilibrium in the previous period to the short-term in the current period.

At present, all kinds of winter wheat fields in China have the problem of large sowing amount to varying degrees, resulting in large groups, vigorous growth before winter and spring, weak stalks, easy lodging, many ears and small ears, easy to premature aging, low yield and other problems.

It is an important link to coordinate the relationship between wheat growth and development and environmental conditions to determine a reasonable sowing amount to obtain an appropriate number of basic seedlings, establish a reasonable group structure, and deal with the contradiction between groups and individuals. The principle of mastery: first, the characteristics of the variety.

It mainly refers to the tillering power, the tillering rate and the number of suitable ears per mu; second, the sowing date is early and late; The third is the fertility level of the soil. Generally, under the conditions of strong tillering ability and high panicle rate, the basic seedlings should be thin and the sowing amount should be less. The cultivation techniques of the following provinces are described in the appropriate sowing amount for reference in each locality.

Rice is sown more extensively. Because in 2017 the sown area of rice was 30,747 thousand hectares, and the sown area of wheat was 24,478 thousand hectares. In 2018, the sown area of rice was 30,189 thousand hectares, and the sown area of wheat was 24,266 thousand hectares.

In 2019, the sown area of rice was 29,694 thousand hectares, and the sown area of wheat was 23,728 thousand hectares. In 2020, the sown area of rice was 30,076 thousand hectares, and the sown area of wheat was 23,380 thousand hectares.

Rice sowing rangeChina's rice cultivation area is also extensive, stretching from Hainan Island in the south, to Heihe in Heilongjiang Province in the north, to the southeast coast below sea level, and as high as the Yunnan-Guizhou Plateau above 2,600 meters above sea level. However, the main area is the Qinling Mountains and the area south of the Huai River. The northern region is dominated by japonica rice, and the southern region is dominated by indica rice.

Summary. 1. To calculate the sowing amount of wheat, we must first determine the target yield according to the soil fertility and water and fertilizer conditions, determine the number of ears per mu by the target yield, and then determine the appropriate number of basic seedlings per mu, and then, calculate the appropriate sowing amount according to the basic number of seedlings, the 1000-grain weight and germination rate of the variety, and the seedling emergence rate in the field. 2. Under normal circumstances, the suitable basic seedlings for various types of wheat fields are:

In intensive sowing high-yield fields, varieties with high panicle rate are 80,000 100,000 per mu, and varieties with low panicle rate are 100,000 120,000 per mu. Semi-precision sowing medium-yield field, 140,000 180,000 per mu. Late wheat is 250,000 300,000 per mu.

400,000 450,000 per mu of single straw wheat. Rice stubble and wheat are 200,000 250,000 per mu. Where the level of soil fertility is high and the water and fertilizer conditions are good, the lower limit is taken, and the upper limit is taken vice versa.

3. The calculation formula of sowing amount is: sowing amount (kg hectares) = basic seedlings (10,000 hectares) 1000-grain weight (grams) 100 germination rate field seedling emergence rate. If the planned basic number of seedlings per hectare is 2.25 million, the 1000-grain weight of seeds is 40 grams, the germination rate is 95%, and the field emergence rate is 85%, then the sowing rate per hectare is:

Sowing (kg hectares) = 225 40 100 95% 85% = 111 kg. The equivalent sowing amount per mu is kilograms.

Okay. 1. To calculate the sowing amount of wheat, we must first determine the target yield according to the soil fertility and water and fertilizer conditions, determine the number of ears per mu by the target yield, and then determine the appropriate number of basic seedlings per mu, and then, calculate the appropriate sowing amount according to the basic number of seedlings, the 1000-grain weight and germination rate of the variety, and the seedling emergence rate in the field. 2. Under normal circumstances, the suitable basic seedlings for various types of wheat fields are:

In intensive sowing high-yield fields, varieties with high panicle rate are 80,000 100,000 per mu, and varieties with low panicle rate are 100,000 120,000 per mu. Semi-precision sowing medium-yield field, 140,000 180,000 per mu. Late wheat is 250,000 300,000 per mu.

400,000 450,000 per mu of single straw wheat. Rice stubble and wheat are 200,000 250,000 per mu. Where the level of soil fertility is high and the water and fertilizer conditions are good, the lower limit is taken, and the upper limit is taken vice versa.

3. The calculation formula of sowing amount is: sowing amount (kg hectares) = basic seedlings (10,000 hectares) 1000-grain weight (grams) 100 germination rate field seedling emergence rate. If the planned basic number of seedlings per hectare is 2.25 million, the 1000-grain weight of seeds is 40 grams, the germination rate is 95%, and the field emergence rate is 85%, then the sowing rate per hectare is:

Sowing (kg hectares) = 225 40 100 95% 85% = 111 kg. The equivalent sowing amount per mu is kilograms.

In principle, the planting density of varieties should be determined according to the characteristics of the variety, water and fertilizer conditions and cultivation methods. Plots with high soil fertility.

Varieties with strong lushness and long growth period should be sparsely planted; On the contrary, in plots with poor soil fertility, varieties with poor lushness and short growth period should be planted densely.

In Liaoning Province, 120,180,000 seedlings per hectare are sown with 60 cm ridge spacing.

In Jilin Province, 182,000 seedlings per hectare are maintained in the eastern region, 182,200,000 seedlings per hectare in the central region, and 202,200,000 seedlings in the western region. Cultivated in narrow rows and densely planted, 300,000 350,000 seedlings per hectare in the eastern region, 250,000 300,000 plants in the central region, and 220,000 250,000 plants per hectare in the western region.

In Heilongjiang Province, conventional (60 70 cm ridge spacing) ridge cultivation is maintained with 250,0028 seedlings per hectare in the central and southern regions and 280,000 320,000 seedlings per hectare in the northern region. Cultivated in narrow rows and densely planted, 330,000 seedlings per hectare in the central and southern regions and 360,000 460,000 seedlings per hectare in the northern regions.

2. Determine the sowing amount according to the planting and cultivation mode: for example, the density of the cultivation mode of the ridge three cultivation mode of large beans should be smaller;

The density of the special narrow row is cultivated in dense planting mode.

3. Determine the sowing amount according to the fertility of the land: for example, the sowing amount of soybean fertilizer should be less, and the sowing amount of thin land should be more.

4. Determine the sowing amount according to conventional habits: such as rice seedbed sowing.

5. According to the seed germination rate, clarity, thousands of grain weight, soil moisture, land preparation quality and other factors that affect seedling emergence (such as diseases, insects, rodents, etc.), flexibly grasp and comprehensively calculate the sowing amount.

1. The calculation of sowing amount should be based on the number of seeds sown per mu, the number of seeds per catty and the germination rate of seeds, and the field loss and return at the time of sowing.

Losses in field management at the seedling stage are calculated. It should also be based on local experience, calculate the number of seedlings, consider the level of land preparation, mechanical operation, management conditions and field loss rate, in the mechanized cultivation method, the general total field loss is slightly greater than that of human and animal cultivation methods.

2. The formula for calculating the sowing amount is as follows:

Sowing amount per mu (catty) The number of seeds that should be sown per mu (including field loss) The number of seeds per catty germination rate Cleanliness rate (clarity).

Corn is one of the main grain, feed, industrial raw materials and biomass crops in China. The planting area of corn in China has been increasing and has become one of the fastest-growing crops in China. Improving the sowing quality of corn is the key way to improve the yield of maize, and the correct sowing quantity is one of the key factors that determine the sowing quality of maize.

If you want a high yield of corn, the key is to look at the amount planted, not how much or less is used in actual production, corn seed yield is affected by a variety of factors, including variety characteristics, soil conditions, climatic conditions, and management levels. Different varieties of maize have different physiological characteristics, and the demand for space, water and fertilizer is also different, so the sowing rate will be different. Soil and climatic conditions provide external guarantees for the growth of maize, but also affect the planting density, which determines the different seed dosages. Therefore, when planting corn, we need to be flexible and choose the right amount of corn to improve yield and quality as the ultimate goal.

There are two main corn sowing methods: seeding machine and acupuncture point seeder, seeding machine with about 4 kg per mu, acupuncture point seeding machine with about 2 kg per mu, seeds should not be too much or too little.

If there are many varieties of corn, it will be particularly crowded after emergence, which is not conducive to cultivating robust seedlings. At this time, it should be refined in time, which requires a lot of manpower to increase production costs. If the amount of seeds is small, the number of seedlings will be less, so that the planting density is low, which is not conducive to the formation of high corn yield.

As long as the above sowing amount, combined with a little thinning seedlings, the best sowing density can be basically achieved. Under normal circumstances, the planting density of early-maturing corn is 4000 acres. However, among the late-maturing varieties, 3500 plants are more suitable.

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To estimate the sowing amount of corn, it is necessary to calculate the sowing amount per mu according to the planting area of corn, the germination rate of corn and the planting spacing of corn, and then multiply it by the planting area to obtain the total sowing amount. It is also possible to estimate the final sowing amount based on the amount of seed required per acre, based on experience.

The most widely cultivated crop in the world is wheat. Wheat is a temperate long-day plant, adaptable to a wide range, from 18 ° to 50 ° north latitude, from the plain to the plateau at an altitude of 4000 meters above sea level, the world yield and planting area of wheat are in the first place in the cultivation of cereals, with ordinary wheat planting is the most extensive, accounting for more than 90% of the total area of wheat in the world, and the sowing area of durum wheat is about 6% to 7% of the total area.

Attention to wheat storageStrictly control the moisture, due to the strong hygroscopicity of wheat, wheat storage should pay attention to precipitation, moisture, should make full use of the wheat harvest after the summer high temperature conditions for exposure, so that the wheat moisture control at the following, and then storage, wheat storage should be done after moisture-proof measures to change the key, and pay attention to the water stratification and upper layer topping phenomenon that may be caused during the ripening period.

Hot into the warehouse closed storage, wheat while hot into the warehouse closed storage, is the traditional wheat storage method in China, through the sun, can reduce the moisture content of wheat, at the same time in the exposure and warehouse closed process can receive the effect of high temperature insecticide and fungus, for the newly harvested wheat can promote the completion of the ripening effect, due to the extinction of pests, the reduction of wheat moisture content and the amount of bacteria, the respiratory intensity is greatly weakened, can make the round wheat long-term safe storage.

The largest food crop cultivated in the world is wheat.

Wheat is a temperate long-day plant, adaptable to a wide range, from 18 ° to 50 ° north latitude, from the plain to the plateau at an altitude of 4000 meters, wheat production and planting area in the world. It is the most widely cultivated cereal, with common wheat being the most widely grown, accounting for more than 90% of the world's total wheat area, and the sown area of durum wheat is about 6% to 7% of the total area.

Most people have given up growing wheat in favor of corn because of the good economic benefits and low seasonal labor intensity, such as in mountainous areas. However, in Guanzhong, Pinghe, Lead, Qiaoyuan and other areas, only one season of wheat is planted, and the main reason for the change is that corn is prone to drought and the yield is reduced, and the economic benefits of planting two crops a year have not increased significantly.

Attention to wheat storage

Strictly control the moisture, due to the strong hygroscopicity of wheat, wheat storage should pay attention to precipitation, moisture, should make full use of the wheat harvest after the summer high temperature conditions for exposure, so that the wheat moisture control at the following, and then storage. After the wheat is put into storage, moisture-proof measures should be taken, and attention should be paid to the water stratification and upper layer topping phenomenon that may be caused during the post-ripening period.

Hot into the warehouse closed storage, wheat while hot into the warehouse closed storage, is the traditional wheat storage method in China, through the sun, can reduce the moisture content of wheat. At the same time, it can receive the effect of high temperature insecticide and sterilization in the process of exposure to the sun and storage, and can promote the completion of the ripening effect for the newly harvested wheat, due to the extinction of the round pest. The reduction of wheat water content and the amount of bacteria carried by wheat greatly weakens the respiration intensity, which can make wheat safe storage for a long time.