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首页> 外文期刊>Australian Journal of Crop Science >Gas exchanges and growth of sesame (Sesamum indicum, L.) cultivated under saline waters and nitrogen-potassium fertilizers
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Gas exchanges and growth of sesame (Sesamum indicum, L.) cultivated under saline waters and nitrogen-potassium fertilizers

机译：在盐水和氮钾肥条件下种植的芝麻的气体交换和生长（芝麻）

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The synergistic action between K and N (NO 3 - ) favors the absorption of both ions by plants. A suitable combination of these macronutrients may be an alternative capable of alleviating the nutritional imbalance due to the excessive absorption of chloride and sodium by the plant and inhibitory competition between nitrate and potassium. In addition, it can favor the control of the turgidity of the cells, through the osmoregulation, elevate the synthesis of organic solutes, promoting the ionic homeostase, and consequently decrease the effect saline stress on the plants. In this context, this study aimed to evaluate the gas exchanges and growth of sesame cv. BRS G4 as a function of irrigation with water of increasing electrical conductivity (ECw) and fertilization with different combinations of nitrogen (N) and potassium (K). This experiment was conducted under greenhouse conditions. Treatments were distributed in randomized blocks and analyzed in 5 x 4 factorial scheme, consisting of five levels of ECw (0.6; 1.2; 1.8; 2.4 and 3.0 dS m -1 ) and four combinations of N and K: N/K 2 O (70/50; 100/75; 130/100 and 160/125% of the recommendation for pot experiments), with three replicates, totaling 60 experimental units. Except for the ECw level of 0.6 dS m -1 , the other salt concentrations evaluated in this study compromised the gas exchanges and consequently growth of sesame cv. BRS G4, at 50 days after sowing. Fertilization with N and K in the combination of 70/50% of the recommendation of N/K 2 O led to the greatest growth of sesame cv. BRS G4. The N/K 2 O combinations of 130/100, 160/125 and 160/125% reduced the negative effects of saline irrigation of 1.2, 1.8 and 2.4 dS m -1 , respectively, on the stomatal conductance of sesame plants. The combined supply of N and K 2 O in combinations of 100/75, 130/100 and 130/100% promoted higher CO 2 assimilation rate in sesame plants using water of 1.2 and 1.8 and 2.4 dS m -1 , respectively.
机译：钾和氮（NO 3-）之间的协同作用有利于植物吸收两种离子。这些大量营养素的适当组合可以是一种能够减轻营养失衡的替代方法，这是由于植物对氯和钠的过度吸收以及硝酸盐和钾之间的抑制性竞争。另外，通过渗透调节，它可以有利于控制细胞的节律性，提高有机溶质的合成，促进离子稳态酶，从而降低盐胁迫对植物的影响。在这种情况下，本研究旨在评估芝麻CV的气体交换和生长。 BRS G4是使用增加电导率（ECw）的水灌溉和使用氮（N）和钾（K）的不同组合施肥的函数。该实验在温室条件下进行。治疗以随机区组分布并以5 x 4阶乘方案进行分析，包括五级ECw（0.6; 1.2; 1.8; 2.4和3.0 dS m -1）以及N和K的四种组合：N / K 2 O（ 70/50; 100/75; 130/100和160/125％的盆栽实验建议值），一式三份，总计60个实验单位。除了ECw的水平为0.6 dS m -1之外，在本研究中评估的其他盐浓度损害了气体交换并因此影响了芝麻cv的生长。 BRS G4，播种后50天。以N / K 2 O的推荐量的70/50％的组合施用N和K导致芝麻CV的最大生长。 BRS G4。 130 / 100、160 / 125和160/125％的N / K 2 O组合分别降低了1.2、1.8和2.4 dS m -1的盐水灌溉对芝麻植株气孔导度的负面影响。 N和K 2 O的组合供应分别为100 / 75、130 / 100和130/100％，在芝麻植物中分别使用1.2和1.8 dS m -1的水促进了较高的CO 2同化率。

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