Before planting from tomato to flowering, the plant growth is small, the demand for nitrogen fertilizer is low, and the nitrogen fertilizer applied in the soil can fully meet the needs of tomato plant growth, so it is not necessary to apply nitrogen fertilizer during this period.
From the time when the tomatoes enter the flowering stage, as the temperature rises, the growth rate of the plants increases, and the growth amount increases. At this time, it is necessary to start to apply nitrogen fertilizer to ensure the nutrient supply of the tomatoes. When the first spike flower is opened, about 20 to 25 kilograms of nitrogen fertilizer can be applied per acre, and the application of potassium fertilizer can be combined to promote the normal growth of the tomato. From the first panicle of the tomato to the fourth panicle of the tomato, the transpiration of the tomato is increased due to the gradual increase of the temperature, and the interval of the watering is gradually shortened, so the nitrogen fertilizer applied per time cannot be excessive. Reduce the loss of nitrogen fertilizer with water. It is also possible to apply water-soluble flushing fertilizer every time watering, and it is advisable to reduce the amount of application.
When the tomatoes enter the picking period, the demand for nitrogen is reduced. At this time, the amount of nitrogen fertilizer can be reduced to about 15 kg, so that the demand for nitrogen fertilizer can be satisfied by the tomato color change, but attention should be paid to increasing the application amount of potassium fertilizer.
CPVC Resin made by polyvinyl chloride( PVC) resin chlorinated modified system. Appearance is white or light yellow, tasteless, non-toxic loose grain or powder.
Characters:
I. Widely used range---Vicat Softening Point than PVC increases by 40℃, one of polymer can be used in high temperature and high pressure for long time;
II. Mechanics performance---tensile strength than PVC increases by 50%, 1 time increases than ABS resin, PP resin, CPVC could still maintain in a strong rigidity, fully meet at this temperature to the requirements of the equipment and pipeline especially close to 100℃;
III. Chemical corrosion resistance---CPVC not only has chemical corrosion resistance in room temperature, but also has good acid and alkali resistance at higher temperature, far better than PVC and other resin, it can replace the traditional material to handle corrosive substance;
IV. Good fire-resistance---CPVC with good self-extinguishing feature, the limiting oxygen index is 60, no form drop, limit flame spread and smoke generation;
V. Low co-efficient of heat conductivity---the heat conductivity of CPVC is 0.105KW/(mk), the CPVC heat-resisting pipes are with less heat loss and the heat insulating layer is unnecessary;
VI. The CPVC will not be affected by the chlorine left in water--Polyolefin Material( such as PP/PE) will decompose when they meet the chlorine left in the water, will not have crack or drip;
VII. The bacteria will not easy to breed---because the CPVC pipe will not be affected by the chlorine left in water, and also can resist the common sterilization chemicals;
VIII. It's same with PVC when processing---the processing way of CPVC finished products is same with PVC product, it's very easy and convenient.
CPVC Resin
CPVC Resin,Chlorinated Polyvinyl Chloride Resin,CPVC Resin Pipes,CPVC Resin Material
Shandong Gaoxin Chemical Co.,Ltd , http://www.gaoxinchem.com