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首页> 外文期刊>Journal of Agricultural Science >Growth and Gas Exchange of Cnidoscolus quercifolius Fertilized With Potassium and Under Water Deficit
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Growth and Gas Exchange of Cnidoscolus quercifolius Fertilized With Potassium and Under Water Deficit

机译：水分亏缺下施钾的小刺桐的生长和气体交换

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摘要

This study aimed to investigate the gas exchange, growth and biomass production of Cnidoscolus quecifolius fertilized with potassium and submited to different water conditions. The experiment was conducted in a completely randomized design, with 4 replications and two plants per experimental unit, with treatments arranged in factorial scheme 3 4, corresponding to three levels of potassium (0 (control), 97.5 and 195 mg dm-3 K) and four levels of water (100% (control), 75%, 50% and 25% of pot capacity). Growth (height, shoot diameter, leaf area, and dry mass) and physiogical parameters (water potencial (w), stomatal conductance (gs), transpiration rate (E), net photosynthesis (A), CO2 intercelular concentration (Ci), carboxylation efficiency (A/Ci), and intrinsic water use efficiency (A/E). Increase in potassium promoted rise in w, gs, E, and A. However, it not influenced the growth parameters, except roots dry mass. Reduction in water levels reduced w, gs, E and A, growth and dry matter production of plants. It is recommended that the substrate moisture level of 75% of the pot capacity in the early growth stages of faveleira seedlings.
机译：这项研究旨在调查在不同水条件下施用钾肥的南美白茅（Cnidoscolus quecifolius）的气体交换，生长和生物量生产。该实验以完全随机的设计进行，每个实验单元重复4次，两株植物，按因子分解方案3 4安排处理，对应于钾的三个水平（0（对照），97.5和195 mg dm-3 K）。和四个水位（100％（对照），75％，50％和25％的锅容量）。生长（高度，枝条直径，叶面积和干燥质量）和生理参数（水势（w），气孔导度（gs），蒸腾速率（E），净光合作用（A），CO2胞内浓度（Ci），羧化作用效率（A / Ci）和内在水分利用效率（A / E）。钾的增加促进了w，gs，E和A的增加，但是除根部干重外，它不影响生长参数。浓度降低了植物的w，gs，E和A，生长和干物质生产，建议在Faveleira幼苗的早期阶段，底物水分含量应为盆栽能力的75％。

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