The lower leaves of the crop are yellowing and brittle, what is the problem? What to do?

This is a sign of nitrogen deficiency in crops, which will grow slower and be prone to defoliation. In such a situation, you can apply some nitrogen fertilizer to the crop, such as urea or animal manure, and make appropriate supplements, not too much.

The cause of leaf yellowing is lack of water, lack of nutrients, dry air and not ventilated, or too much watering, you can move it to a ventilated and sunny place with appropriate amount of watering and fertilization.

Whether it's a potted plant at home or a field crop, it's not uncommon to find that the leaves of the plant turn yellow, gradually wither over time, and finally fall off. Plants rely on the photosynthesis of leaves to produce organic matter once there are no leaves. This means that the plant is not far from dying.

There are different reasons for the different colors of plants to turn yellow, so let's take a look at some of the reasons for the yellowing of plants.

1.It is wet yellow, due to excessive soil moisture and lack of oxygen in the soil, it is difficult for the root system to breathe, the root system is hindered from absorbing water and fertilizer, and the growth can not be carried out normally, resulting in the light yellow of the top leaves of the new branches, and the dark yellow of the old leaves of the seedlings, and then wither and die. At this time, the soil should be loosened and drained in time to control the amount of irrigation.

2.It is dry yellow in color, and drought will wilt the seedlings. At this time, photosynthesis is weakened, growth stops, the transport of photosynthetic products is hindered due to lack of water, a large amount of organic matter in the plant is hydrolyzed, and respiration is enhanced.

Due to the redistribution of water in the plant, the new leaves absorb water from the old leaves, causing the old leaves to turn yellow.

3.Dark yellow in color, the normal growth of the plant requires twice the light intensity of the light compensation point. At this time, the organic matter produced by the photosynthesis of the plant not only compensates for the respiratory exertion, but the remaining organic matter can also meet the normal needs.

If there is not enough light, it will cause the plant cells to differentiate smoothly, the seedling stems and branches will become thinner, and the leaves will turn yellow. The precaution is to increase the light in time.

4.Insect yellow, in the process of seedling raising, often invaded by pests, especially all kinds of pests that feed on leaves, prick and suck mouthparts, harm leaves or suck leaf sap, cause leaves to shrink, curl, leaf spots, yellowing. Attention should be paid to observation, early prevention, and timely and appropriate symptomatic spraying of pests.

5.Pure yellow in color, crops are also very sensitive to certain trace elements, in addition to being essential for nitrogen, phosphorus, potassium and other macroelements. It is also reflected in the color of the leaves, such as iron, zinc, magnesium, sulfur, and manganese, which will result in the green and yellow color of the leaves.

Therefore, it is necessary to improve the seedbed every other year and pay attention to the application of organic fertilizer.

6.Fat yellow in color.

Too much or too little fertilizer can adversely affect crops. When the fertilizer is too thick or too much, it can hinder the penetration and transport of the plant, resulting in new leaves becoming hypertrophied, leaves wrinkled but not stretching, and old leaves turning yellow but not falling off. Lack of fertilizer can lead to shoots, long internodes, and thin, yellow leaves.

This is usually caused by too much fertilization, which can be mitigated by watering.

The yellowing and drying of crop leaves is due to the lack of water in the soil, and if the soil is deprived of water, it will cause the leaves of plants to turn yellow and dry up. Underwatering or overwatering, if the plant is not properly hydrated, can easily cause the leaves to turn yellow. Yellowing and withering of leaves is a natural phenomenon of aging, and it also belongs to normal metabolism.

The most common cause of yellowing of leaves comes from.

1. Water yellow. Too much watering leads to long-term water accumulation in the soil, poor air permeability and even partial fibrous root rot. It shows that the young leaves are dull yellow and dull, and the tips are shriveled.

2. Fat yellow. It is a lot of fat, which is manifested as the old leaves falling off, and the new leaves are thick and shiny but uneven, and some small cabbage or radish seeds can be sprinkled with some small cabbage or radish seeds, and pulled out after the seedlings emerge, so as to consume nutrients.

3. Dry yellow. If there is no watering or dehydration for a long time, although the new leaves are normal in color, the lower leaves gradually dry up and fall off and age.

4. Alkali yellow. In particular, some flowers in the south prefer acidic soil, while the water quality in the north is alkaline, and the leaves gradually fade, turn yellow or even fall off. The easiest way to do this is to pour fermented rice washing water or rainwater.

Hello: Come.

The leaves of your plant are yellowing and drying up, which is due to two reasons: one is due to lack of water.

Du watering should be watered thoroughly, and the lack of water in the flower pot can easily cause the leaves to turn yellow, and the second is because of the lack of fertilizer:

Plants grow strongly, grow rapidly and need more adequate fertilizer, lack of fertilizer is also easy to lead to yellow leaves and curl, to the flower shop to buy compound fertilizer, but fertilization is not easy to be too much, a little bit can be, too much fertilizer is easy to burn roots, about 5 months to apply fertilizer.