Requirement On Nutrient And Accumulation On Biomass By Up-ground Parts Of Tea Plants Under Field Conditions

In this dissertation, it is studied that accumulation charactreistics of the biomass and requirement on nitrogen, phosphorus, potassium, calcium and magnesium by tea plants with different ages and different varieties under field conditions. The main results were as follows:1. Accumulation characteristics of the biomass and requirement on nitrogen, phosphorus, potassium, calcium and magnesium by tea plants with different ages under field conditions. In order to study on requirement on N, P, K, Ca and Mg by tea plants with different ages under field conditions, the biomass on up-ground parts of Longjing 43 tea plants aged 1, 2, 3, 5 and 10 years in the fall of the first year, and the young shoots, the fallen leaves and the pruning on the second year under different N, P, K, Ca and Mg application was investigated. The biomass of up-ground parts in tea plants aged 5 years and the concentration of N, P, K, Ca and Mg in tea plants increased 32, 21, 25, 29, 23.2, 21.5 times respectively as compared with those aged one year. The biomass and the concentration of N, P, K Ca and Mg in tea plants aged 10 years only increased approximately by 71%, 17%, 13%, 14%, 42.1%, 15.9% respectively as compared with those aged 5 years. The annual requirement of N, P, K, Ca and Mg for tea plants aged 1~2 years under field conditions is 90.01, 5.71, 31.11, 14.26, 3.47 kg/hm~2 respectively. The annual requirement of N, P, K, Ca and Mg for tea plants aged 2~3 years is 122.74, 9.63, 45.14, 45.14, 21.67 kg/hm~2 respectively. The annual requirement of N, P, K, Ca and Mg for tea plants aged 3~4years is 144.03, 10.33, 47.99, 28.61, 9.93 kg/hm~2 respectively. The annual requirement of N, P, K, Ca and Mg for tea plants aged 5 years is about 164.4, 12.68, 71.29, 24.90, 6.92 kg/hm~2 respectively. The concentration of N, P, K, Ca and Mg in the plucking tea plants is mainly used in the growth of tea shoots, and maintain in a stable state and only share a small part of the total, approximately 7.54, 0.53, 5.44, 3.19, 0.36 kg/hm~2.After pruning, the absorbed N, P, K, Ca and Mg in part is recovered to the soil through pruning and fallen leaves, the amounts of N, P, K, Ca and Mg in tea plants used for growth (pruning and fallen leaves are excluded) account for 43.9%, 48.7%, 61.3%, 44.1%, 47.8% of the total respectively.2. Accumulation characteristics of the biomass, nitrogen, phosphorus, potassium, calcium and magnesium by tea plants with different varieties under field conditions. The biomass, the young shoots, the content on N, P, K, Ca and Mg by the biomass and the content on nutrient by the young shoots were clearly difference by tea plants with different varieties. The biomass and the young shoots are related respectively to the content on N, P, K, Ca and Mg.The biomass and the young shoots on Longjing43, Yabukita, Okumidori were all successively: Longjing 43> Yabukita> Okumidori. The content on N by Longjing 43 was about two times than Yabukita and Okumidori. The content on P, K, Ca and Mg was respectively 1.5, 2, 1, 1 times and 3, 5.5, 1.5, 3 times than Yabukita and Okumidori. The young shoots by Longjing 43 was largest, and was 3.83t/hm~2, the content on nutrient by Longjing 43 was largest corresponding.Accumulation characteristics of the biomass and requirement on nitrogen, phosphorus, potassium, calcium and magnesium by tea plants with different ages and different varieties under field conditions have been cleered-out preliminary. A researched method was established in this investigation, thus it provides a new idea for the further investigation on the nutrient requirement of tea plants, also provides a reference for scientific feritilize.