The deficiency of main mineral elements in the seedling stage of Kenaf was observed with the use of Hongma 1 as the material. The deficiency of N, Ca, Mg, Fe, S, and B had significant effects on the upper symptoms of the plants, such as slow growth, few leaves, chlorosis of leaves, etc., and the fresh weight of all the treatments lacking 70% of the control. Among them, the absence of Ca and Mg deficiency was only 7.5% and 19.5% of the control, and the absence of N, Ca, Mg, Mo, etc. had significant differences in dry matter accumulation compared with the control. The deficiency symptoms of kenaf seedlings are as follows: Lack of N: The growth of plants is short, the stems are thin and upright, the leaves are small, and the leaves turn yellow from the bottom up and dry off. The amount of roots was slightly less than that of the control. Lack of P: stems are thin and weak, underdeveloped, with few branches, small leaves, often dark green-blue-green leaves, lack of P appear first in the middle edge of the old leaves purple black, gradually to the two ends of the development, the leaf to the middle roll Finally, the entire leaf is rolled into a tube and dried. The roots were poorly grown. The length of their roots and the number of lateral roots were all less than those of the control, and they were mostly yellow-brown. Lack of K: Plant growth is inhibited with few branches and plants are soft. Dark and dull leaves, leaves often from the tip of the old leaves, edges gradually dry yellow, leaf curling uneven. The amount of roots was also significantly smaller than that of the controls, especially the shorter lateral roots. Absence of Ca: The morphological change of Ca deficiency is extremely obvious. Plant growth is severely inhibited and plants are dwarfed. The top growing point and young leaves lost chlorosis and wilting, and later the stem tip died. The tip and petiole died. The roots were significantly reduced. The apical meristem cells rotted and died. The main roots were slender, and the lateral roots were few and short and slender. Lack of Mg: Plant growth is thin, leaves are sparse and smaller. The leaves are slightly grayish green. The leaves of the entire plant are drooping, and the upper leaves are chlorotic. Branching symptoms are similar to those of the main stem. The root system was also significantly suppressed, especially if the amount of lateral roots was small. S deficiency: Plant growth is short, small and yellow, with poor root development and fewer lateral roots. Deficiency of Fe: abnormal plant development, mainly in the new leaves chlorosis, chlorosis between veins, leaves in the leaf, the leaves on the branches also significantly yellow. Although the total amount of roots was slightly lower than that of the control, the roots significantly exceeded the control in the length of the root. Absence B: The plant growth is short, the stem is thick and hard, the plant is slightly curved, the leaves are hypertrophic, rough, wrinkled and curled, some are withering like water loss, and the leaves are pale at the growing point. Roots are stunted, brown and less lateral roots. Cu deficiency: Plant growth is thin, the leaves often droop, the leaves have necrotic streak or spots, the main root is white and long, but the number of lateral roots is slightly shorter than the control. Mn deficiency: The stems are shorter and the stems are weaker. The leaves are small, and the young leaves become yellow after green and the green veins are clear. The root system is weak and the number of lateral roots is small. Deficient in Mo: The plant is short and the old leaf veins are yellowish green with brown spots. The leaf margins are scorched and curled, and the leaves are deformed. Roots are shorter than fetuses. The main symptoms of the deficiency of kenaf. One is the first occurrence from the base, such as the lack of N, P, K, Mg and so on. Another - class damage is from the top, such as the lack of Ca, Fe, Mn, B and so on. From the point of view of the symptoms, the treatments showed different performances. Some of the nutrients are sensitive to treatment and have obvious symptoms such as lack of N, lack of P, lack of Ca, lack of Mg, and lack of Fe deficiency. Some of the symptoms of lack of nutrients treatment are not very obvious, such as the lack of K, S, Mn, Zn, Mo, B and so on. Based on a variety of nutrient-depleted treatments, this study conducted a comprehensive observation of the combination of morphological structure and physiology combining ground and underground. The observation results indicate that N, P, K, Ca, Mg, S and B, Fe, Zn, Mn, Cu, Mo and other elements are all essential elements for the normal growth of Kenaf, and the lack of any one of them will make the growth of plants incongruous. , causing diseased conditions in the leaves or roots, reducing the biological yield.
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