What are the latest symptoms of nutrient deficiency in kiwifruit
Kiwifruit, also known as the Chinese gooseberry, is a relatively popular fruit in our country. Therefore, there are quite a lot of people growing kiwifruit now. When growing kiwifruit, we should pay attention to doing a good job of fertilizing. To meet the growth nutrients needed for kiwifruit growth. However, many people overlook the application of trace elements, which leads to nutrient deficiency symptoms during kiwifruit growth and affects the yield and quality of kiwifruit. So what are the nutrient deficiency symptoms of kiwifruit? Let's take a look below!
1. Calcium deficiency
Calcium is an important element in the composition of plant cell walls and can improve the photosynthesis of kiwifruit trees. Reasonable calcium element can extend the aging time of kiwifruit fruit and enhance the hardness and storability of kiwifruit. If kiwifruit lacks calcium, then the color of the leaf veins at the base of mature leaves begins to fade, gradually necroses, and forms necrotic patches. Then leaf withering and leaf drop gradually appear, causing shoot death. In severe cases, it will affect root growth and cause root tip death. An appropriate amount of superphosphate, calcium nitrate, etc. should be applied to the soil to prevent calcium deficiency symptoms.
2. Magnesium deficiency
Magnesium element is also very important for the growth of kiwifruit. It has the effect of regulating the plant's photosynthesis and hydration. Reasonable magnesium element can promote fruit expansion and improve fruit quality. When growing kiwifruit, magnesium deficiency is relatively common. It generally appears on mature leaves of the current year, where the color between the leaf veins and at the leaf margins gradually turns yellow-green. However, there is not much effect from the base to the petiole. Generally, the reasonable magnesium content of leaves should be around 0.4%. If the magnesium element content in new leaves is lower than 0.1%, then it will cause leaf chlorosis and necrosis, forming horseshoe-shaped leaves.
3. Sulfur deficiency
Sulfur element is also an indispensable nutrient in the growth process of kiwifruit trees. It is mainly composed of amino acids and enzymes and is very closely related to nutrients such as carbohydrates, fats, and proteins in the kiwifruit tree body. If kiwifruit lacks sulfur, then the growth rate will drop significantly, the color of young leaves will be mainly light green, and chlorotic patches will gradually expand. In severe cases, the vein network of young leaves will all show chlorosis, and the leaf veins will also show chlorosis, but the leaf margins will not scorch. If there is sulfur deficiency, then an appropriate amount of ammonium sulfate, potassium sulfate, and other fertilizers can be sprayed for supplementation.
4. Chlorine deficiency
Chlorine element, like magnesium element, has a relatively large relationship with photosynthesis and hydration in the kiwifruit tree. Kiwifruit trees are relatively sensitive to changes in chlorine element content. When chlorine is deficient, chlorosis first appears on the main and lateral veins at the top of old leaves. Old leaves show leaf curling and reverse curling, the area of young leaves decreases, and root growth rate declines. The position about 3 cm from the root end will become swollen, mainly because rainwater washes away the chlorine element and causes chlorine deficiency. If chlorine deficiency occurs, then fertilizers such as potassium chloride should be applied appropriately.
The above is a simple introduction to what the nutrient deficiency symptoms of kiwifruit are. In addition to the above, many elements such as manganese, iron, boron, zinc, copper, and sodium can also show deficiency symptoms. Therefore, everyone must pay more attention.