The yellow leaves are yellow, the young leaves are fresh yellowish white, the leaf tips are green, and the rust-colored streaks appear on the middle and lower leaves, spraying ferrous sulfate + plant electronic fertilizer on the leaf surface; magnesium hydroxide and lime are applied in the field. Adjust soil pH; and add potassium to regulate nutrient balance.
Anti-flower buds are not open. Due to the cold season, the field is short of water, the air is humid, the soil pH is above 7.5, the soil self-generated boron is reduced in effectiveness; there is excessive lime and calcium in the field, and the boron is induced to induce boron deficiency, which can cause the flower buds to be not for a long time. open. At this time, the blasted borax is supplemented with boron.
Anti-frozen fruit, in the low temperature and low light period, the fruit is expanding, the demand for nitrogen, potassium and boron is large, and the relative demand for phosphorus is small. If the phosphorus input is too large, it will affect the absorption of potassium and boron, making the fruit seed fleshy. Less and rigid. Phosphate fertilizer should be applied in the planting ditch, and pure phosphorus should be applied in the later stage. Potash fertilizer should be applied until the result.
Anti-decidation and fruit loss, zinc deficiency caused the plant gibberellin synthesis decreased, the lower leaves yellowed off, young fruit softened and fell. Timely prevention and control, found that aging eucalyptus leaves spray zinc sulfate to prevent shedding and promote growth.
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