The acidity and alkalinity of the soil depends mainly on the amount of acid and alkali substances in the soil. The acidic substance is derived from the carbonic acid formed by the dissolution of carbon dioxide in water and the.......

At present, rapeseed in Hunan Province is at the end of flowering to pod-forming period. It is expected that Hunan rapeseed will mature in the middle and early May in May and harvest 3 to 5 days later than normal. According to the Hunan Climate Center, the average temperature in mid-April t.......

When the company started the urban rail aluminum alloy body project in 2003, it introduced the cutting equipment such as plasma cutting machine, high-pressure water jet cutting machine and laser cutting machine. These three different methods of blanking have their own advantages and disadva.......

From today (11th) to 15th, for five consecutive days, strong cold air will affect most of China, and there will be obvious cooling and windy weather in the north. There will be small to moderate rain in most parts of the south. The temperature drop in most parts of the north is 6~12°C, a.......

There are usually many options for the field of feed for the farm, and the way to improve production performance and reduce production costs is most acceptable. At the same time, they refused to use processing methods that did not achieve the expected production performance and increased co.......

According to the monitoring and forecast of the China Meteorological Administration, due to the influence of cold air, some areas of the central and eastern parts of the Qinghai-Tibet Plateau and the northeastern region have rainy and snowy weather from 22 to 24, including 22 to 23 northeas.......

introduction

Sow breeding is one of the important links in pig production. In production practice, how to improve the performance of sows is the focus of pig production. The number of sows born, the high survival rate of piglets, and the use of extended sows have always been the goa.......