Effect of increasing levels of nitrogen on yield of tea in different agro-ecological conditions of Pakistan

Field experiment was conducted on mature tea bushes of Qi-Men variety at two different altitudes from sea level i.e. at National Tea Research Institute Shinkiari （1000 m） and on farmer＇s field in Konsh valley at village Battal （1500 m）. Different levels of nitrogen with constant dose of phosphorus and potassium were applied to observe the optimal dose of nutrients for highest yield under local edaphic conditions. The experiment was repeated for three consecutive years. The highest yield of fresh tea leaves were obtained by the application of 420 kg ha^-1 N followed by the application of 360 kg ha^-1 N at 1000 masl. The highest dose of nitrogen also reduced significantly the soil pH in the upper （0-15cm） layer depth during 1998 and 1999. During the year 2000, the reduction in soil pH was observed by the application of highest dose of nitrogen but was non-significant at 5% level. The lower soil depth （15-30 cm） showed the reduction in pH with the highest dose of nitrogen during the experimental year but was statistically non significant. At the higher altitude of 1500 masl the highest yield of fresh tea leaves was obtained by the application of 420 kg ha^-1 during the experimental years but the increase was significant during the year 1999 and 2000. The yield of the fresh tea leaves was positively correlated with the amount of nitrogen application at both the altitudes. The increasing amount of nitrogen decreased the soil pH at both the depths of 0-15cm and 15-30cm. Unlike the lower altitude （1000 m） there was no any significant reduction in the soil pH during 1998 and 1999. A significant reduction in soil pH was found in the year 2000.     

茶树内源IAA和ABA与茶树生育的相互关系(英文)

通过用HPLC检测茶树根系及芽梢的内源激素IAA和ABA含量,研究了茶树生长与内源激素的关系.根系中IAA和ABA的含量,在地上部生长休止期间达到最高,随着芽梢的生长逐渐下降,IAA与ABA的比值越小,根系生长越快,Al能显著促进茶树根系生长,根系生长 AlpH4.5> Al pH3.5>-Al pH4.5>-Al pH3.5,根系IAA与ABA的比值按上述顺序依次增大,新梢中IAA和ABA的含量在萌动芽中最高,随着芽的生长逐渐下降.新梢的生长不仅受IAA和ABA含量的影响,更受二者比值的影响,在芽梢中,IAA与ABA的比值越高,新梢生长越快.     

引种蒜头果的幼苗生长表现及区位生长差异性分析

从云南引进蒜头果种子,在合肥、黄山地区试种,观察其1年生幼苗抗旱抗寒能力、病虫害情况,定期定株测苗高、地径,绘制生长苗高、地径生长曲线及生长量曲线图,比较两地蒜头果生长差异,预测该苗在安徽的生长情况。试验证明:1年生蒜头果幼苗在安徽低海拔地区生长良好,初步反映蒜头果对安徽气候特点有一定的适应能力;就当年生长量而言,合肥地区苗木生长好于黄山,说明该苗喜排水良好的中性或偏碱性土壤。     

宣城市油茶产业发展对策浅析

宣城市地处油茶适生区,发展油茶产业的优势与劣势并存。立足基地建设,面向长三角市场,化江浙沪皖四地交汇的交通优势为产业优势,引进油茶精深加工产业集群,是本市油茶产业的发展出路。     

西双版纳棚栽辣木主要害虫及防治

介绍了西双版纳棚栽辣木存在的主要害虫:朱砂叶螨(Tetranychus cinnabarinus Boisduval)、美洲斑潜蝇(Liriomyza sativae Blanchard)、斜纹夜蛾(Prodenia litura Fabricius)和小菜蛾(Plutella xylostella L.)为害症状和防治。     

不同基质对杜鹃红山茶容器苗生长的影响

以杜鹃红山茶为供试材料,设置8种不同基质栽培处理,比较分析不同基质栽培对杜鹃红山茶地径、苗高、叶片数和总叶绿素含量的影响。结果表明:S5(50%椰糠+40%泥炭藓+5%珍珠岩+5%粗河砂)、S6(50%腐熟木屑+20%泥炭藓+20%椰糠+5%珍珠岩+5%粗河砂)、S7(50%椰糠+20%珍珠岩+20%蛭石+10%粗河砂)3种混合基质配比物理化学性质稳定,有机质含量较高,且能较大地增加杜鹃红山茶苗木的地径、苗高、叶片数和叶绿素含量,有效促进杜鹃红山茶对养分的吸收和生长,是较为理想的配比组合,建议在生产上推广应用。     

黄柏与茶树复合经营研究

黄柏为我国传统中药材树种,茶树为我国传统饮料树种,两者均为潜山县山区林农收入的重要来源。本文介绍了黄柏与茶树复合经营模式的造林技术、经济效益与生态效益。     

铁观音茶树微喷灌的生理效应研究

以田间栽培的4年生铁观音茶树为试验材料,研究干旱季节微喷灌对铁观音茶树生理生化指标的影响。结果表明：微喷灌处理的铁观音茶树叶片总叶绿素含量和类胡萝卜素含量分别提高18.40%和5.18%;净光合速率、胞间CO2浓度、蒸腾速率以及气孔导度都显著增加,有效改善茶树的光合特性;新梢数量提高21.61%,新梢长度增加4.85cm,新梢叶片数量增加1.5片,茶叶的鲜重和干重得到显著增加,分别提高75.00%和61.22%;同时,微喷灌处理的鲜茶叶中含有较高的茶多酚和蛋白质,以及较低的咖啡碱,从而提高了茶树的营养价值和口感。     

水肥对高产无性系油茶果实产量的影响

以肥料氮(N)、磷(P)、钾(K)不同施用量和灌溉水量(H2O)为试验因子,采用二次通用旋转组合设计,研究了水肥对油茶鲜果产量的影响。结果表明,N、P、K和H2O的用量对油茶鲜果产量均存在显著的影响,且N与K、K与H2O对油茶鲜果产量存在显著的互作效应。试验因子间的交互作用使油茶鲜果产量明显提高,达到最大值时4个因子的编码值分别为:N为1.03、P为0.62、K为1.19、H2O为0.92,即全年每株油茶施有效养分N 181.8 g、P2O5 48.6 g、K2O 287.1 g,灌水29.2 kg,相当于每hm2施用N 795 kg、P2O5 80 kg、K2O 474 kg,灌水48 m3。采用该方案,油茶鲜果产量可达到最大为5 131 kg hm2。     

泰安市茶树种植气候条件分析

利用泰安市5个气象台站1970-2004年的气候资料,结合茶树的生态学特性,探讨了泰安市气候条件对茶树生长发育和茶叶品质的影响,系统分析了有利和不利的气候因素,由此提出了泰安市茶园栽培管理技术措施和对茶叶产业发展的建议.