Fatty symptoms
Kiwifruit shows signs of dryness and defoliation on the edges of the leaves, browning of the pith or formation layer, and blackening (acute), or blackening of the veins (chronic). It usually occurs at different times after fertilization. Especially in the case of sunny days after heavy rains, the outbreak focused on the outbreak. Many fertilizers are caused by large amounts of unfermented organic fertilizers, excessive application of chemical fertilizers, excessive fertilization, and close to roots. Prevention of fertilizer damage should start from the aspects of on-demand fertilization, scattered application, flushing with water, and formula fertilization. It should be noted that the roots of kiwifruit are fleshy roots with high osmotic potential and are not tolerant to high-concentration fertilizers, especially those with good water-solubility. Therefore, plucking or rotary ploughing after spreading and one-step operation of water and fertilizer should be promoted to avoid localized fertilization. Concentration, causing burning roots.
How to prevent
1. Improve the fertilization method. When basal fertilization is applied, the fertilization area is generally suitable for the outer edge of the crown projection, and should not be too close to it. The fertilization method should be based on furrows and acupoints, avoid spreading, fertilize to a depth of 30 to 40 cm, and fully stir and mix soil with earth. When top dressing is applied in the growing season, it should be applied timely after top dressing or when the soil is wet after rainfall. For top dressings outside the roots, suitable types of fertilizers should be selected, and the concentration should be strictly controlled. Generally, the concentration of sprayed foliage should not exceed 0.3% to 0.5%, and spraying at high temperatures should be avoided.
2. Strictly control the amount of fertilizer. When chemical fertilizers are applied, the amount of each application should be less, and the principle of “a small number of times†should be mastered, especially for nitrogen fertilizers.
3. Apply farmyard fertilizer to fully decompose and mix with soil before applying.
4. When using a variety of fertilizers, carefully select the type of fertilizer to avoid chemical reactions and cause fertilizer damage.
5. Qualified fertilizers produced by regular manufacturers are strictly forbidden to use fake counterfeit fertilizers.
Remedy
For those who have already suffered from fat damage, the causes should be traced, and corresponding remedial measures should be taken in time to minimize the harm. For fertilizer damage caused by improper fertilization, immediately pour with large water and dilute the fertilizer concentration. If the roots have been severely damaged, the soil in the fertilizing area should be dug, the roots that have been rotted should be cut off, and the short-term rooting should be carried out. The soil should be backfilled in about 10 days. The soil should be changed seriously and the upper dead branches should be pruned.
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