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effect of Combined Application of Organic and Inorganic fertilizers on Methane Emission from Paddy Soil and Rice Growth

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Pedosphere 1997年第4期7卷 379-382页

作者： LIUKEXING LIAOZHONGWEN 等 CollegeofNaturalResourcesandEnvironment SouthChinaAgric.Univ.Guangzhou510642（China） CollegeofNatural

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Chinese yam yield is affected by soil nutrient levels and interactions among N, P, and K fertilizers

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Chinese Herbal Medicines 2023年第4期15卷 588-593页

作者： Yang Chen Xianzhi Zhou Lina Ma Yongsheng Lin Xiangui Huang Agricultural Bio-Resources Institute Fujian Academy of Agricultural SciencesFuzhou 350003China Scientific Observation and Experiment Station of Fuzhou Ministry of Agriculture and Rural AffairsFuzhou 350003China

Objective: The current fertilization methods for Chinese yam are uneconomic and unfriend to environment. A rational one is very important to achieve desired balance of high yield of Chinese yam, economic and friend to environment. Here, we studied the effects of nitrogen(N), phosphorus(P), and potassium(K) fertilizers on the yield of ’Qinfeng’ Chinese yam in shallow-groove directional ***: The experiments were conducted in Dehua County, Fujian Province, China using a "3414" optimal design. Overall, three fertilizer factors(N, P, and K) were evaluated at the following four levels: 0, no fertilizer;1, 0.5-fold the typical rate;2, typical fertilization rate;and 3, 1.5-fold the typical rate. There were 14 different fertilization ***: Treatment 6(N2P2K2) produced the longest(75.6 cm) and thickest tubers(4.9 cm) with the highest tuber fresh weight(1311.9 g) and yield(41 015.9 kg/hm2), whereas, treatment 1 produced the shortest(65.6 cm) and thinnest tubers(3.9 cm) with the lowest fresh weight(953.4 g) and yield(28 532.8 kg/hm2) among the 14 fertilizer combinations. The experimental data could be fitted to single-variable quadratic and binary quadratic models but not to a ternary quadratic polynomial model. Appropriate N, P, and K fertilizer application rates increased Chinese yam yield. However, excessive fertilization lowered the yield. Chinese yam yield was significantly and strongly correlated with the amounts of N, P, and K fertilizer ***: Based on the single variable quadratic and binary quadratic models, we propose that the quantities of N, P, and K fertilizer used to grow 1 hm^(2)’Qinfeng’ Chinese yam should be 360–388.3,90–100.95, and 416.3–675 kg, respectively.

关键词： Chinese yam Dioscorea opposite Thunb fertilization formula fertilizer effect nitrogen phosphorus potassium

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

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Agricultural Science & Technology 2006年第1期7卷 14-22页

作者： F.S. Hamid Tahira Ahmad National Tea Research Institute Shinkiari Mansehra Pakistan Department of Biological Sciences Quaid-I-Azam University Islamabad 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.

关键词： Camellia Sinensis. L yield altitudes fertilizer effect soil pH Pakistan

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