How to Conduct Soil Testing and Fertilizing in Greenhouses
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Soil sampling: the use of diagonal or checkerboard type in greenhouses or flat grounds, 3 to 10 meters from the ground angle and in the ground, each selected point, each point iron excavation of a deep width of each 20 cm to 30 cm profile Take about 0.5 kilograms of soil on the upper, middle, and lower levels, mix the soil samples, and take 1 (about 0.5 kilograms) of the soil with the “10†mark and put it in a plastic bag and write it on the label. Go to townships, villages, groups, sampling people and dates, and send them to the laboratory for testing. Terrain complex fields, using the "Zi" type of sampling points, the method with the diagonal or checkerboard type.
Water samples: For an area, because the groundwater quality is more complex, the water quality of the same village varies greatly from place to place. Therefore, “one well and one water†should be used. Each sample of 0.5 kg of water should be taken into the bottle (the sampling bottle should be washed twice or three times with this well water before sampling), and the township, village, and group should be written on the label. Azimuth (or well number), sample submitter and date, in time for laboratory testing.
Fertilizer (fertilizer): Take 0.25 kg of the same type of fertilizer in the upper, middle and lower layers of each bag and mix it. Divide the sample to 0.5 kg by quartering method. Paste the manufacturer's name, product name, and mark. Content, fertilizer location, time, delivery sample township, village, group, name, timely sent to laboratory testing.
After the soil testing, according to laboratory results, intention to plant crops, yield indicators, fertilizer nutrient content and other factors, the use of fertilizer requirements = [(target output crop target yield nutrient absorption rate) - (measurement value of soil nutrients 0.15 correction factor)] [ Fertilizer nutrient content Fertilizer Seasonal Utilization] formula, you can calculate the amount of fertilizer required.
