What to Do When Corn Seedlings Change Color? Causes and Control Methods
Corn is the most common crop in rural China, and for many farmers it is the main source of income. Apart from when it suffers from pests and diseases or dies, the leaves and stems of corn stay green and dark green. But many farmers, when planting, find that corn seedlings show abnormal color, specifically yellowing, whitening and purpling of the leaves. What is going on here? Come to Qinnong Web to see the detailed introduction.
1. Yellowing of seedling leaves
The leaves of the seedlings begin to lose their green color and gradually turn yellow. This is mainly because the seedlings grow weakly and are not robust. In addition, sowing too deep, high planting density and poor soil are also factors leading to this phenomenon. If no measures are taken in this situation, in the later stage all the leaves will wither and fall off, leaving only a bare stalk.
Control methods: Choose plump, large seeds, treat them to promote germination before planting to increase the germination rate, plant at a reasonable density, strengthen management, weed frequently, and apply more nitrogen fertilizer to promote rapid, robust growth.
2. Whitening of seedling leaves
Whitening of seedling leaves mainly occurs around the time the seedlings grow 3-4 true leaves. At this point the leaves begin to appear yellow-white. As the seedlings grow and new leaves emerge, the yellow-white area keeps expanding, and finally the entire leaf except for the veins turns yellow-white. Purple also appears at the base, and after ten days to half a month, the purple turns white, the leaves become thin and weak, and from a distance they show a white seedling phenomenon. In fact, all of this is caused by a lack of zinc in the seedlings.
Control methods: Now that we know the whitening of seedling leaves is caused by zinc deficiency, we can treat the root cause. Apply more zinc fertilizer, and pay attention to the method when fertilizing: mix the zinc fertilizer evenly with fine soil, then sprinkle it beside the roots or seeds. You can also spray the leaves with a zinc fertilizer preparation, or mix the seeds with zinc fertilizer before planting.
3. Purpling of seedling leaves
Purpling of seedling leaves generally occurs after 2-3 true leaves have grown. As with the above two, the seedlings begin to lose their green color and gradually turn purple, especially the leaves, which are the most obvious. In addition, they also show extremely slow growth. This is in fact related to a deficiency of the phosphorus that the seedlings need for growth. In addition, low-lying, waterlogged areas are also prone to causing this phenomenon.
Control methods: Apply more phosphorus fertilizer. As above, pay attention to the method when fertilizing, carry out intensive cultivation, strengthen management, drain water promptly after the rainy season, and strengthen pest and disease control.
The above are the causes and control methods of corn seedling discoloration brought to you by Qinnong Web. From the above it can be seen that the main cause of corn seedling discoloration is a deficiency of some substance, so when planting, apply sufficient base fertilizer and use a reasonable combination when fertilizing; it is not advisable to apply a single fertilizer.