茶树专用控释肥在幼龄茶园的肥效研究

在山东两年生幼龄茶园中分别施用金正大茶树专用控释肥CRF1（N—P2O5-K2O=25—4-11）、CRF2（N—P2O5-K2O=20—6—14）和普通肥料CCF（尿素＋复合肥＋碳酸氢铵），其中CCF处理年施入纯氮量为100．8kg／hm2，CRF1处理设置3个水平CRF1—1、CRF1—2和CRF1—3，其肥料施用量按纯氮计算分别为CCF的100％、80％、50％；CRF2处理设置2个水平CRF2—1、CRF2—2，其肥料施用量按纯氮计算分别为CCF的100％、50％。大田试验结果表明：（1）、CRF1—1和CRF2—1在春、夏季显著提高土壤中有效氮、磷、钾含量；但在秋季，所有处理均表现出营养元素供应不足的现象；（2）、控释肥处理能显著增强茶树光合速率，增加百芽重，同时提高氨基酸含量，降低酚／氨比，进一步提高山东绿茶品质；（3）、山东幼龄茶园肥料施用量偏少．席在CR砣-1处坪的基础上继续试验来确定最佳浓肥量．

Efficiency of Special Controlled-release Fertilizer on Young Tea Garden

The Kingenta special controlled-release fertilizers(CRF1、CRF2) and the common fertilizer(CCF) were applied in 2-year-old tea garden.The pure nitrogen yearly application amount of CCF was 100.8 kg/hm2;that of CRF1-1,CRF1-2,CRF1-3,CRF2-1,CRF2-2 was 100%,80%,50%,100%,50% of that of CCF respectively.The field experiment results were as follows.The application of CRF1-1 and CRF2-1 could remarkably increase the contents of available N,P,K in soil in spring and summer,but the nutrients in all treatments were in short supply in autumn.The application of CRF also could increase the photosynthetic rate,100-bud weight,amino acid content and reduce the ratio of polyphenol to amino acid so as to improve the quality of green tea in Shandong.The fertilizer application amount in Shandong young tea garden was in short supply.The experiment should be conducted continuously to make sure the best fertilizer application amount based on the CRF2-1 treatment.