Soil testing can also help reveal the cause of nutritional problems and is most valuable when used as a supplement to leaf analysis. Samples were taken in early March or after harvest. Take 12 points from the orchard with relatively uniform soil and a small area. The sampling points are set at 4 points at the outer edge of the crown, 4 points at 2/3 of the distance between the trunk and the crown, and 4 points between the rows (according to The percentage of root distribution is taken from soil samples). Ordinary soil samples are collected vertically with a soil auger. Trace element soil samples are collected simultaneously with ordinary soil samples. Avoid using metal tools such as iron and copper when sampling.
Collect about 1 kilogram of ordinary soil samples and about 1.5 kilograms of trace element soil samples. The sampling depth is 0 to 100 centimeters. Every 20 centimeters is a layer, and the upper and lower layers are collected in equal quantities. After the sample is air-dried, crushed and sieved, a part is extracted using the quartering method and passed through a 0.25 mm sieve (the sieve aperture is determined according to the measurement item), leaving no more than 200 grams of sample.
Through orchard soil analysis, we can understand the abundance and deficiency of soil nutrients, which is an important reference for determining the type and amount of fertilizer.