The clumping maple can reduce the amount of nitrogen leaching and improve the fertilizer efficiency of nitrogen. Therefore, it is necessary to supply the available nitrogen and phosphorus in time during the seedling stage and the seedling stage of the clumping maple, and the gradual decomposition of organic fertilizer is the nutrient source of the clumping maple throughout the growth period.
Available nitrogen and phosphorus throughout the growth period
Mixed clumping maple fertilization must understand the relationship between various fertilizers. Not all fertilizers can be mixed and some fertilizers cannot be mixed together. For example, ammonium尼特拉te cannot be mixed with superphosphate, and fertilizers with the word "ammonium" cannot Mixed with alkaline fertilizers to avoid loss of nitrogen.
The effect of fertilization on the clumping maple is determined by many factors, among which the ratio of nitrogen, phosphorus, and potassium is the main factor affecting fertilizer efficiency. For example, the total amount of nitrogen, phosphorus, and potassium is the same, but the mixing ratio is different, and the effects vary greatly. The experimental results show that the ratio of nitrogen, phosphorus, and potassium is 3:2:1 (ie 15 kg of nitrogen + 10 kg of phosphorus + 5 kg of potassium). The ground diameter, seedling height and dry matter of the clumped pentagonal maple The content is significantly higher than other combinations, and the yield of qualified seedlings is high. When the ratio of nitrogen, phosphorus, and potassium is 4:2:1, the yield of qualified seedlings is the lowest, indicating that too much nitrogen makes the ratio of nitrogen, phosphorus, and potassium imbalance, and inhibits the growth of clumping maple.
Nutritional diagnosis
When the clumping maple lacks nutrients, it will show the symptoms of j+I_fix. According to the symptoms of clumping maple, the nutritional status of clumping maple can be initially diagnosed. When the clumping maple is deficient in nitrogen, the cells become smaller and the whole plant is stunted. The leaves turn from the lower part to light green to yellow-green, and gradually spread to the upper part. When the nitrogen fertilizer is too much, the stems and leaves are soft, the clumping maple grows wildly, and it is vulnerable to pests and diseases, and the resistance is poor, which is not conducive to the healthy growth of clumping maple, and the survival rate of clumping maple decreases.
When the clumped maple is deficient in phosphorus, the leaves are dark green, and some are purple or purple. When there is severe phosphorus deficiency, old leaves turn yellow, plants are short, and root systems are underdeveloped, especially the root branches are not good. When the clusters of Pentago枫在磷不足,部分开发elop very slowly in the early growth stage and shrink, especially when the new shoots are underdeveloped, and the leaves are dark green to dark purple. Except for the top buds, the leaves of red pine and larch clustered five-cornered maple are dark purple starting from the lower leaves.
When a cluster of five-cornered maple is lacking in potassium, yellowish-brown spots are produced between the veins of the old leaves and the edge of the tip of the leaf, and the stem is thin and sometimes bent downward. In severe potassium deficiency, the whole plant turns yellow. Potassium-deficient larch and red pine clustered five-cornered maple are dark green to light yellow, and the top buds are shrinking.
When the clumped maple is lacking in calcium, the activity of the growth point is weakened, and the top buds bend into a crochet shape and then die. Forest tree seeds lack calcium during germination, and the growth and development of seedlings are strong抑制。
When the clumped maple is lacking in magnesium, the lower leaves turn yellow-green-brown to red, and gradually spread to the upper new leaves. The tips of the lower leaves of the clumped maple are yellow-green to peach-yellow or reddish-brown in the middle to late development period. As the degree of lack increases, it will affect the upper new leaves. When the larch and red pine clusters are lacking in magnesium, the leaves are yellow-green to yellow.
When the clumped maple is iron-deficient, the new leaves do not die, and change from brown to yellow to white, and sometimes the leaves wither. The yellowing phenomenon occurs when the clumping maple is lacking in iron and manganese, sometimes accompanied by tissue necrosis. When the red pine lacks iron and manganese, the new shoots turn yellow to yellow-white, and gradually spread to the lower leaves.