First, the carbon-nitrogen ratio of corn stover is 65-85:1, and the ratio of carbon to nitrogen that is suitable for microbial activity is 25:1. After the straw is returned to the field, the nitrogen in the soil is insufficient, and the microorganism competes with the crop for nitrogen. The wheat seedlings will suffer from nitrogen deficiency. Yellow, thin, poor growth. Solution: After the straw is crushed, spread 50 kg of ammonium bicarbonate or 20 kg of urea per acre on the surface of the straw, and then plow.
Second, anti-stalk crushed too thick. Some crushed stalks are too long and their length is less than 5 centimeters and more than 10 centimeters, which is not conducive to ploughing and affecting sowing. Solution: Use a large straw crusher with a relatively large horsepower, so that the straw is finely crushed, and the rotation is deeper, and the straw is evenly mixed with the soil.
Third, after the straw is returned to the field, the soil is too loose, large pores, wheat seeds can not be in close contact with the soil, affecting the germination and growth, root is not strong, and even "hanging root" phenomenon. To solve this problem, in addition to improving the quality of straw smash, we must pay attention to the following aspects: (1) Apply enough nitrogen, phosphorus and potassium fertilizers. (2) Improve soil moisture. (3) Improve the quality of sowing. (4) Timely suppression and watering. After wheat sowing, it was air-dried for 1 day and was pressed with Dendrobium to densify the soil.
In addition, the diseased straw can not be returned directly to the field, otherwise the summer corn is prone to disease. This kind of straw should be destroyed or put into the farmland after high-temperature composting.
Key Storage Lock Box Storage Key Box
Feature Hanging key storage box with combination access to keys.
Large key storage compartment holds for house,car,or padlock .
Hangs from doorknob,fence,or just about anywhere
Personalized,adjustable combination lock with 4 dials offers up to 10,00 combination possibilties for optimal security.
USE
- Put it in a car or mount on wall
- Storage keys, door cards, and credit cards
- While moving out, door key can be put in the key box for the next user
- With shackle advantages: conveniently hangs on door knob, railing or fence
Shengping Safety Protection Locks Manufactur, create to set up in 1989, is an enterprise specialized in the manufacture of different kinds of locks. We have obtained quality system authentications as ISO9001-2000 International Quality Control System Attestation,and we have obtained self-operation export and import right etc. According to many years of producing and R&D experience, we produce locks more than 100 kinds of specification with different kinds of raw materials & styles. Moreover, we can do customized work as per clients`designs.
Bearing the sense of [quality gets victory", our products are popular in domestic market; and with the fame of our product`s [good quality and best prices", we have increased our export all over the world. Now our product lines are mainly for export.
We tightly hold the quality control system, follow the contract, and keep faith and valued mutual benefit. We sincerely welcome customers home and abroad and our craft brothers to develop and flourish the locks market.
Key Storage Lock Box,Metal Key Storage Box,Digital Key Storage Lock Box,Portable Key Storage Lock Box
Shengping Safety Protection Locks Manufacturer , https://www.chinajiuzhou.com