In the process of growth and development of corn, if there is a lack of trace elements, it will show a variety of corresponding symptoms. Recognizing the deficiency of corn and scientifically applying trace fertilizers to remedy it is an important technique in corn cultivation.
(1) The chlorosis of the young leaves at the seedling stage of zinc deficiency is pale yellow and produces white seedlings. The middle leaves have obvious green stripes, and the old leaves at the base are gray-brown. At this time can be applied 1.5 kg of magnesium sulphate or 0.2% -0.3% zinc sulphate solution for foliar spray, continuous spray 3 times, each time interval 5-6 days.
(2) The old leaf of molybdenum lacks green and yellow between leaf veins, leaf margin scorches inwards and grain shrinks. At this point can be used 0.15% -0.2% molybdic acid solution for foliar spray.
(3) The chlorotic chlorosis was found between the veins of the new leaves of iron deficiency. The veins remained green with obvious stripes, and the stems and leaf sheaths were purple-red. At this point with 0.2-0.3% ferrous sulfate solution spraying, even spray 3 times.
(4) Boron-deficient young leaves do not bloom and appear white, and gradually wither and die. Old leaves have white stripes between the veins, and the plants are short and thin. At this time, 85 grams of borax or 60-60 grams of boric acid can be sprayed on the foliar, and sprayed three times.
(5) Symptoms of deficiency of manganese often start from the new leaves, the young leaves turn yellow, there are green spots between veins, the leaves are soft and the roots are slender and white. At this point can be used 0.2% manganese sulfate solution for spraying 2-3 times, each time interval 7-10 days.
(6) The copper-deficient plants grew slowly, dwarfed, and clustered after the top dead. The leaves were grayish yellow or red and yellow with white spots. The development of the ear was poor. Can be forced to apply 1 kg of copper sulfate or 0.2% copper sulfate solution for foliar spray.
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