First, fertilization off: In the early spring when the pond water temperature is stable at 8 °C ~ 10 °C, that began to chase fertilization material to cultivate natural food in water. The amount of fertilization should be determined based on the quality of water, fertilizer, and fertilizer. G---
Release date: 2008-04-08 Experts call for: strengthening the health supervision of children with neurofibromatosis In an article published in the latest issue of Pediatrics, experts proposed to strengthen the health supervision of children with neurofibromatosis. Neurofibromatosis (NF) is main---
Yellow-skin shoot rot, also known as yellow dead skin disease. In Guangzhou, Nanhai, Dongguan, Sanshui, Huizhou, Shantou and other places. Those who suffer from mild disease reduction will suffer no gains and even the entire park will be destroyed. The serious disease rate will reach 70-90%. Firs---
Reasonable breeding strictly selects male and female rabbits that meet the requirements for species selection, and prevents inbreeding. Male and female rabbits are maintained at an appropriate ratio. The ratio of male to female of general field (household) is 1:8, and the ratio of pure breeding of---
First, the purpose of trimming cherry tree during the aging period significantly weakened, fruit production and quality decreased significantly, should be updated in a timely manner. Second, the pruning method usually utilizes the developmental branch that is formed by the base of the stem branch---
Release date: 2008-03-24 US FDA's performance standards for medical equipment and pre-market approval. According to the US Code of Federal Regulations, Class I, Class II, and Class III medical devices are subject to the general regulatory requirements for medical devices (including business---
Talking about Some Problems in Biogas Tanks in Rural Areas 1. Fermentation method: Rural biogas digesters mainly adopt semi-continuous fermentation method, ie after the biogas digester produces normal gas, new materials are added from time to time and not quantitatively. In the fermentation proce---