How many wheat seedlings are most suitable for planting per mu now? A formula for calculating the sowing rate of wheat is attached

Autumn is the season of harvest, and wheat will soon be planted in the twinkling of an eye. The sowing time of wheat in the northern region is generally after Cold Dew and before Frosts Descent. Many farmers are not sure how much wheat is most suitable for sowing. Today we will talk about it in detail.

The spacing between sowing rows of wheat is helpful to high yield.

Now wheat sowing is generally sowed by sowing machine, the machine sowing back is straight and uniform, the seed is uniform, and the sowing depth is the same, which is beneficial to wheat seedling Qi, whole and strong. It is better to plant with equal row spacing of 15-16 cm, which can increase surface cover, reduce surface water evaporation, and save water and increase production.

In order to facilitate the management of wheat fields, it is appropriate to leave a width of 20 cm and a depth of 3-4 cm between each sowing site, so that the wheat can survive the winter safely, carry out "loam soil" to preserve soil moisture, sow seeds without constant suppression, and wait 1-2 days after sowing. 0.5-1 kg of dry soil layer on the surface is then suppressed, which is conducive to preserving soil moisture.

What is the most suitable sowing rate of wheat?

In order to prevent uneven emergence of wheat, many farmers always increase the amount of sowing, and some farmers even double the increase. Plant protection experts suggest that we must control the sowing rate, the sowing rate is too large, there are many seedlings per unit area, individuals compete with each other, resulting in weak seedlings, it is easy to lodge, thus reducing production.

In general, under the condition of suitable sowing time, the large panicle type varieties with low tillering rate are suitable for basic seedlings 150000-180000 per mu, and the middle panicle varieties with high tiller panicle rate are suitable for basic seedlings 120000-150000 per mu. Within this range, there should be less high-yield land and more middle-yield land. Sowing later than the suitable sowing date, sowing 2 days per night, increasing basic seedlings by 10, 000 to 20, 000 per mu. The basic seedlings per mu in dry farming and late stubble wheat fields were 120000-160000 and 200000-300000 per mu, respectively.

In the suitable sowing period, the sowing rate of semi-winter varieties in general plots is 7 kilograms per mu, and that of weak spring varieties is 9 kilograms per mu. The suitable sowing rate per mu of dry land is 7.5m / mu, and that of paddy land is 12.5m / mu, 15kg / mu, respectively. If the suitable sowing period is advanced or postponed by 1 day, the sowing amount per mu will be reduced or increased by 0.5 kg.

If the sowing time is postponed, it is necessary to increase the sowing amount appropriately, generally sowing one day every night, the sowing amount will be increased by 0.25ml 0.5kg. When sowing, a seeder should be used to sow seeds, which requires accurate sowing quantity, uniform sowing and uniform depth, so as to ensure the sowing quality.

How to determine the sowing amount of wheat

According to the predetermined basic seedlings, seed germination rate, field emergence rate and 1000-grain weight and other factors, the sowing amount was determined. Generally speaking, in the case of sowing at the right time, suitable soil moisture and normal seed germination rate, the sowing amount can be determined according to the principle of "ten thousand seedlings per kilogram".

From the point of view of economic cultivation with the best benefit, the best scheme and the least risk, it is easiest to obtain large area high yield with semi-precision sowing and basic seedlings of about 160000 per mu, that is, the amount of seeds per mu is about 8 kg.

For example, it is more appropriate to sow seeds on October 5-10 in Weifang, Shandong Province, about 8 kg per mu, and about 10 kg per mu on October 15.

Calculation formula of wheat sowing rate

In order to calculate the sowing amount of wheat, the target yield should be determined according to the conditions of soil fertility and water and fertilizer, the number of spikes per mu should be determined by the target yield, and then the suitable number of basic seedlings should be determined by the number of spikes per mu, 1000-grain weight of varieties, germination rate and field emergence rate.

The experience of "500 grams of ten thousand seedlings" is often used in production. However, due to the deviation of variety, seed and soil preparation quality, it is required to calculate the sowing amount per mu according to the following formula:

Sowing amount per mu (kg) = planned seedlings per mu × 1000-grain weight (g) / (1000 × 1000 × germination rate × field emergence rate)

Finally, we specially remind farmers to do a good job in the post-broadcast crackdown.

If the suppression work is not done, especially if straw is returned to the field and rotary tillage is used, due to the loose soil in the plough layer, it is easy to cause wheat sowing too deep, form deep sowing weak seedlings, affect the occurrence of wheat tillers, cause insufficient number of spikes and reduce yield.

Suppressing the wheat with a pressure twice after sowing can ensure the normal growth of the root system after emergence and improve the ability of drought and cold resistance.

Matters needing attention

Due to the excessive sowing rate and many basic seedlings, wheat is easy to lodge in the later stage, especially after the re-application of jointing and booting fertilizer, which makes it difficult to apply the most important topdressing in wheat production, which limits the improvement of wheat yield. In production, the sowing rate should not be expanded blindly, but should be reasonably determined according to the sowing time and other conditions.