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桂林地区是我国重点新兴柑桔基地之一。通过本研究证实桂林柑桔基地分布着大面积的贫锌、含硼、钼低的土壤类型,包括:古洪积物、砂页岩、河积物、石灰岩坡积物发育的土壤,初步估计仅缺锌面积达20万亩。合理施用微量元素肥料(锌、钼、硼),一般使柑桔产量提高20%以上,果实全糖含量均有所提高(4.4—17.2%),柠檬酸略有下降或保持不变。喷施锌肥果皮变薄,可食部分增加。喷施钼肥提高果实内维生素C的含量4.70—8.40mg/100ml果汁,柑桔成熟期提早7—10天,果皮着色鲜艳。土壤有效态Mo,Zn,Co,K,Ca和Mg等元素与柑桔叶片中相应的该元素之间均呈正相关,经统计达到显著或极显著水准。因而通过叶片的分析,可以有效的估量土壤中某些营养元素的丰缺状况,为合理地科学施肥提供依据。
Guilin is one of the key emerging citrus bases in China. Through this study, it was confirmed that a large area of low-zinc, boron- and molybdenum-rich soil types are distributed in Guilin citrus base, including paleoclimate, sand shale, river sediments and soil with limestone slope sediment development. Preliminary estimates Zinc deficiency area of only 20 million mu. Rational application of trace element fertilizers (zinc, molybdenum, boron) generally increases the yield of citrus by more than 20%, increases the total sugar content of fruits (4.4-17.2%) and slightly decreases or remains the same for citric acid. Spraying zinc fertilizer thinning, edible part of the increase. Spraying molybdenum fertilizer to increase the content of vitamin C in fruits 4.70-8.40mg / 100ml fruit juice, citrus maturity 7-10 days earlier, the skin brightly colored. The soil available Mo, Zn, Co, K, Ca and Mg were positively correlated with the corresponding elements in citrus leaves, and reached significant or extremely significant levels by statistics. Therefore, through the analysis of the leaves, we can effectively estimate the abundance and deficiency of some nutrients in the soil and provide the basis for reasonable scientific fertilization.