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首页> 外文期刊>Agricultural Science & Technology Newsletter >Effect of increasing levels of nitrogen on yield of tea in different agro-ecological conditions of Pakistan
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Effect of increasing levels of nitrogen on yield of tea in different agro-ecological conditions of Pakistan

机译：巴基斯坦不同农业生态条件下氮素水平提高对茶叶产量的影响

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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 tealeaves 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 and2000. 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 year2000.
机译：在距海平面两个不同高度的齐门品种的成熟茶树丛上进行了田间试验，即在国家茶叶研究所新木里（1000 m）和在Battal村的Konsh谷地的农民田间（1500 m）。应用不同水平的氮和恒定剂量的磷和钾，以观察在局部土壤条件下最高产量的最佳养分剂量。连续三年重复该实验。通过施用420 kg ha〜（-1）N，然后在1000 masl施用360 kg ha〜（-1）N，可获得最高的鲜茶产量。在1998年和1999年，最高剂量的氮也显着降低了上层（0-15cm）深度的土壤pH。在2000年期间，通过施用最高剂量的氮可观察到土壤pH的降低，但不降低土壤的pH。显着水平为5％。在实验年中，较低的土壤深度（15-30厘米）显示pH降低且氮素的剂量最高，但在统计学上不显着。在1500 masl的较高海拔下，在实验年中施用420 kg ha〜（-1）可获得最高的新鲜茶叶产量，但在1999年和2000年这一增长是显着的。在两个高度上，新鲜茶叶的产量与施氮量呈正相关。氮的增加使0-15cm和15-30cm深度的土壤pH降低。与较低的海拔高度（1000 m）不同，1998年和1999年的土壤pH值没有任何显着降低。2000年发现土壤的pH值显着降低。

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