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利用 FQ 型红外线 CO_2分析仪测定的结果表明,白魔芋(A.albusP.Y.Liu et J.F.Chen)最大光合效率为8.20 mg CO_2/dm~2·hr,低于普通作物如水稻、甘薯、菜豆等光合效率的一半。另一方面,阴性植物如蜂斗叶、襄荷、款冬等光合效率只有2—5mg CO_2/dm~2·hr。魔芋光饱和点为20klx,而阳性作物如水稻光饱和点达50—60klx。因此,魔芋应属于半阴性(semi-shading)植物。用不同层数纱布制成的荫蔽罩作荫蔽栽培,结果表明荫蔽和非荫蔽(对照)间产量差异达极显著。对照病毁率达87.5%,而三层纱布荫蔽(4.9%的相对照度)的发病率只有12.5%。
The results of FQ infrared CO_2 analyzer showed that the maximum photosynthetic efficiency of A. albus P.Y.Liu et JFChen was 8.20 mg CO 2 / dm ~ 2 · hr, lower than that of common crops such as rice, sweet potato and kidney bean Half the photosynthetic efficiency. On the other hand, the photosynthetic efficiency of negative plants such as Bucket Bufo, Xiang He, Coltsfoot is only 2-5 mg CO 2 / dm ~ 2 · hr. Konjac light saturation point of 20klx, while the positive crops such as rice light saturation point of 50-60klx. Therefore, konjac should belong to semi-negative (semi-shading) plants. Shade covers made of gauze of different layers were used for shading cultivation and the results showed that the difference in yield between shaded and non-shaded (control) was extremely significant. The rate of disease control was 87.5%, while the three-layer gauze shade (4.9% relative illuminance) was only 12.5%.