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|標題:||A Study of Mineral Deficiency Symptoms of Passionfruit
H. L. Lin
L. H. Fu
K. C. Lee
|關鍵字:||Symptom;症狀;Mineral Deficiency;Passionfruit;營養失調;百香果||Project:||Horticulture NCHU, Volume 14, Page(s) 61-76.
興大園藝, Volume 14, Page(s) 61-76.
3.缺鉀:缺鉀處理上位葉黃化，表現類似缺鐵症狀，其基部之髓細胞亦有退化之情形，以組織速測法檢定時並無紅色結晶出現，植株鉀濃度為2.56％(對照組為6.11％)其鐵濃度為 66 ppm 較對照組為低。
6.缺鐵:缺鐵處理一週時，中段葉片變黃，小葉脈仍呈綠色，新葉則出現黃白化現象，鐵濃度為 70 ppm比對照組相對部位 76 ppm 稍低。
8.缺鋅:新葉黃化，下位葉質地較硬，植株鋅濃度為 22 ppm均比其他處理為低。
In this study, water-culture technique was employed to induce mineral deficiency in passionfruit. The treated samples were then subjected to quick, simple tests as well as to leave analysis for any anomalies and symptoms brought about by the treatments. The results were finally recorded by photography to serve as a referrence for the diagnosis of nutrition-deficiency in the field. The important data so obtained are as follows:
1.Nitrogen-deficiency: The deficient plants manifested yellowing of leaves at the lower position of the stem after two weeks of mineral-deficient cultivation. Their growth was also retarded. The nitrogen level in the plants was 2.33% which amounts to one half of that of the controls.
2.Phosphous-deficiency: No Sign of abnormality was perceptible. The leaves at lower position were greener than usual. Their P content was 0.29%.
3.Potassium-deficiency: Potassium-deficiency: Potassium-deficiency caused the yellowing of top leaves as in the case of Fe-deficiency. The pith cells at the base also showed sign of deterioration. Rapid tissue analysis revealed there were no red crystals in the plants. P concentration of the samples was 2.56% against 6.11% for control sets. Their Fe content was 66 ppm which was lower than the controls.
4.Calcium-deficiency: Five weeks after treatment, the edges of new leaves were twisted and dry followed by appearence of necrotic spots.
5.Magnesium-deficiency: In the course of two-week Mg-deficient growth, the areas between the veins of the leaves turned yellow. In serious cases, the cells in those areas decayed. The amount of Mg found in the plants was 0.2% which was less than that of the controls (0.58%).
6.Iron-deficiency: After one week of treatment, the leaves in the middle portion of the stem became yellow however the side veins remained green as usual, the new leaves appeared yellowish white as the Fe concentration dropped to 70 ppm; slightly less than 76 ppm found in the coresponding parts of the controls.
7.Mangnese-deficiency: The new leaves on the 1 1/2month treated plants were yellow in color, but the side veins however were still green. The Mn level of the treated plants was only 10 ppm, much lower than the 81 ppm detected in control sets.
8.Zinc-deficiency: New leaves were all turning yellow. The leaves which at the base were more stiff, in teture than the normal ones. The quantity of Zn in this treated samples was 22 ppm which was lower than any values so far obtained for other treatments mentioned above.
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