Poplar is characterized by fast growth, early planting, high yield, and easy renewal. It is a fast-growing timber tree species with the largest cultivated area in the plain area and the highest wood yield. Therefore, poplar planting has obvious benefits and a wide range of uses. It has good development prospects and potential.
Poplars generally reach maturity within 6 to 10 years, and there are two growth peaks per year: the vegetative period in spring (May to June) and the summer vegetative period (from July to August). Yang Shuxi fertilizer water, timely and reasonable top-dressing at the peak of growth, can improve the soil fertility of forest, and promote the growth of poplars. The following is a brief introduction on the issues related to poplar dressing technology.
Fertilizer time After poplar plants are planted, they can be topdressed in the same year, and they can be applied twice in early May and late July. In the year of afforestation, it can be applied less and later.
The type of fertilization and the amount of fertilizer to be top-dressed are generally based on available nitrogen fertilizer. Every year, 667 square meters (1 mu) can be applied with 15 kg of urea and 30 kg of ammonium bicarbonate. In the spring, nitrogen fertilizer and binary compound fertilizer are the main fertilizers. At this time, the effect of slow urea fertilizer efficiency is low.
Fertilizing methods can be applied to acupuncture points and can also be applied as a trench. Each tree opens 4 points in different directions, with a depth of 0.2 meters, a width of 0.1 meters, a length of 0.4 meters, 100 grams of urea/strain or 200 grams of ammonium bicarbonate; the second time, the direction of fertilizer is staggered with the direction of the first fertilization. . Fertilize by furrowing, ditch depth 20 to 30 centimeters. Pay attention to digging or digging in the outer edge of the canopy, not too close to the trunk, so as not to burn roots. Top dressing should be combined with watering so as to ensure that the fertilizer efficiency is fully exerted.
The symptoms of poplar nutrient deficiency show 1 nitrogen deficiency. Nitrogen-deficient plants were the most inhibited in growth, with the least number of leaves and the smallest leaf area. Leaves were light green to yellowish green; roots were dark brown, fine and long, but root volume was slightly more than potassium deficiency and phosphorus deficiency. 2 potassium deficiency. Plant dwarf: small leaves, dark green color at the beginning of the leaves, uneven foliage and gradually dark brown spots of necrosis from the base of leaves, gradually distributed in the whole leaf; root volume is less, roots are slender. 3 Phosphorus deficiency. The plants are shorter and shorter; the leaves are smaller, the veins and leaf margins appear slightly purple, and the leaves are densely villous; the root volume is less. 4 lack of magnesium. Plant height, leaf area and number of leaves are close to normal plants; leaf folds, uneven development, yellowish-green veins between veins, chlorotic spots near the leaf margin at the late stage, yellow to greenish necrotic spots, but upper The leaves were normal; the amount was not significantly reduced and the roots were longer. 5 iron deficiency. High growth is less inhibited, from the base of the first 3 to 4 leaves began to appear chlorosis phenomenon, the green veins do not disappear around the leaves, the more the younger leaves more serious loss of green, the green light around its veins is shallow, but the lower The old leaves always do not appear green.
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