| This paper deals with the trunk-injected neem absorbed, concentrated and degraded by Citrus sinensis (Linn.) Osbeck, and influences of the neem on physiological index of leaves and fruits. The results are summarized as follows:The ratio of pesticide and water could objectively reflect the capacity of plant to absorb solvent. The absorption ratio was varied with time, with the largest volume of 35.8mL/h at 2:00-3:00pm, when the temperature was the highest in a day. The average total absorption volume was 221.8mL, and the ration of pesticide to water was 2.98.The dynamics of neem uptake and degradatin were identical for various concentration treatments, or the peak of neem absorption appeared at the 9th -10th day after treatments. The total absorption volumes were not proportional to the total solution usage. Neem could be tested from the leaves-injected treatments with various concentrations at the 60th day after treatments. However, it could not be tested from the leaves sprayed with solution 7 days after treatments.Chlorophylla in the injected leaves remarkably decreased, while free-prolin, cell membrane relative permeability and Malondialdehyde (MDA) increased in proportional to the injection solution usage.The physiological indexes of fruit of C.sinensis (L.) Osbeck were not different between treatments, such as soluble sugar content, soluble slide content (SSC), sugar- and SSC-acid ratio, but the content of vitamin-C had a remarkable decline when the trunk-injected dosage of azadirachtin (effective dose per-cm stem-diameter) was greater than 0.05g. |
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