Seedlings are the foundation of afforestation, especially the development of economic forests and the construction of high-quality and high-effect gardens. The purchase of nursery stocks is directly related to the survival, growth, yield and economic benefits of fruit seedlings. Therefore, in the purchase of quality seedlings to do nine things:
First, pay attention to variety selection. Varieties must be pure and suitable for local natural environment conditions, subject to approval by the competent authority. In general, scientific research units and competent technical departments directly cultivate and introduce and promote varieties that are fine varieties.
Second, pay attention to seedlings specifications. High-quality seedling height and inter-terrestrial diameter should reach Grade II or above, with developed root system, more lateral roots and fibrous roots, and even distribution. Roots lose less water or lose water.
Third, pay attention to grafting degree. Grafted seedlings must heal firmly at the interface.
Fourth, pay attention to the development of buds. High-quality fruit trees and seedlings must be filled with more than six leaf buds within the plastic belt above the fixed site to ensure that good shoots are given after drying.
Fifth, pay attention to seedlings without damage. To buy seedlings without mechanical damage. At the same time, during transportation and planting, damage must be prevented. Six, pay attention to pests and diseases. To choose a quarantine proof, seedlings without pests and diseases.
Seven, pay attention to maturity. To select smooth twigs, I bring autumn shoots and good seedlings.
Eight, pay attention to the water content of seedlings. To buy fruit tree seedlings, choose fresh bark, less water loss, wrinkle-free seedlings. After the selection, planting should be followed along with the transport and the bare period of seedlings should be shortened.
Nine, pay attention to large seedlings with fetal soil. For fruit seedlings with more than three years, they should be brought up with seedlings (bags), transported and planted.
(5) Maize 5-7 leaf stage, with lots of weeds such as Cyperus rotundus, field bindweed, peony, and grey vegetable, can be applied with 56% dimethyltetrachloro-sodium salt soluble powder 80-100 g/mu; 48 % Prunella 200-250 ml/mu; 40% Happiness (halogenated torazine) 80-100 ml + 56% dimethyl tetrachloro sodium 50-60 g/mu. (6) After the 8-10 leaves (80 cm in height) of the corn, more weeds will be plotted, and 20% paraquat aqueous solution 150-200 ml/mu will be sprayed between the rows. If the field weeds are sparse, add a close herbicide, such as 40% isopropylate 150-200 ml + 20% paraquat 200 ml/mu.
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