To assist farmers in cultivating durian on demand, giatieu.com cites documents from the world's most reputable reference sources.
Lack of nutrition, yellow plants, stunted, poor development …
The symptoms of malnutrition manifested in durian leaves described below have been collected and evaluated by the world's leading research institute.
Lack of nitrogen. The most common symptom, mature leaves are pale yellow but do not cause defoliation. The veins of the leaves are also yellow.
Lack of phosphorus. Leaves are much smaller than full fertilization methods.
Lack of potassium. Symptoms appear first on older leaves, characterized by the yellow of the leaf tip, extending to the leaf margins. Afterwards, the yellow-colored leaves become brown and necrotic.
Calcium deficiency. The disease is characterized by severe stunting, small leaves and necrosis on leaf tips of medium and old leaves.
… lack of magnesium.
Magnesium deficiency. Yellow appears mainly on older leaves, starting from the middle of the leaf near the midrib and extending to the leaf edge. The main tendon remains green. May cause leaf drop.
Lack of sulfur. Symptoms first appear on young leaves, initially small yellow spots and yellow spots that grow larger, with the remaining green veins. The leaves often form convex curves on the upper surface of the leaves.
Iron deficiency. The young leaves do not form chlorophyll, with the remaining major veins becoming markedly green.
Manganese deficiency. The tree is stunted, the old leaves become green and yellow, with veins still green. Leaves tend to fall out.
… lack of copper
Lack of copper. Finally, the young leaves are deformed, have a brown border, following the withering of the tips. Therefore, there is an increase of lateral shoots, but it is also not overcome.
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