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澄江两岸是黄岩主要柑桔产区,也是我国优质高产多品种产桔区之一,澄江沿岸41公里,拥有桔园25000余亩,占黄岩柑桔总面积40％多,占全县柑桔总产量70％左右。 但自1967年澄江两岸柑桔园受咸潮水倒灌影响以后,造成近千亩柑桔树枯死和上万亩柑桔园受害,致使近十余年来的柑桔树体生长衰退,产量徘徊不前。1980年冬至1981年春,又出现大面积柑桔树落叶枯梢现象,使柑桔产量和品质明显下降,为此,对澄江两岸柑桔树势衰退、产量和品质下降等原因,进行了探讨。 材料与方法 试材:为50余年生的柑桔树,品种以构头橙为砧木的本地早、早桔和槾桔等;土壤以冲积物和浅海沉积物为母质,质地为砂壤土至粉砂粘土。 方法:将澄江两岸全长41公里的柑桔区划分为五段,每段在南北两岸各设一调查观察点,并在每点上按离江远近划分小区,每一小区内各品种树,又按生长结果状况以及
The two sides of Chengjiang River are the major citrus producing areas in Huangyan and one of the orange producing areas with high quality and high yield in many varieties. The 41 kilometers of Chengjiang River coast has 25,000 acres of orange orchard, accounting for 40% of the total area of citrus in Huangyan, Production is about 70%. However, citrus orchards on both banks of Chengjiang River were affected by the intrusion of saline water in 1967, causing the death of nearly a thousand mu of citrus trees and the killing of 10 mu of citrus orchards. As a result, the growth of citrus trees declined over the past ten years and the output did not fluctuate before. From the winter of 1980 to the spring of 1981, the phenomenon of deciduous leaves of large-scale citrus trees appeared again, which led to the obvious decrease of the yield and quality of citrus fruits. Therefore, the reasons of the decline of citrus tree vigor and the decrease of yield and quality of both sides of Chengjiang River were discussed. MATERIALS AND METHODS Specimens: Citrus trees with more than 50 years of life, local early, early orange and orange sclare with head oranges as the rootstock; soil with alluvial and shallow sea sediment as the parent material, and sandy soil with the soil as the texture Sand clay. Methods: The 41-kilometer citrus region on both sides of Chengjiang River was divided into five sections. Each section was set up a survey observation point on both sides of the north and south. At each point, the district was divided according to distance from the river. Each species, Again according to the results of the growth as well