Elevated and super‐elevated CO₂ differ in their interactive effects with nitrogen availability on fruit yield and quality of cucumber

Abstract

Elevated CO promotes cucumber yield largely by carbon allocation from source leaves to fruits in high N availability. Besides a dilution effect, carbon allocation to fruits, carbohydrate transformation, and nutrient uptake and assimilation can affect the fruit quality. © 2018 Society of Chemical Industry.

Interactive Effects of the CO2 Enrichment and Nitrogen Supply on the Biomass Accumulation, Gas Exchange Properties, and Mineral Elements Concentrations in Cucumber Plants at Different Growth Stages

“…In the present work, the R/S was significantly decreased with N supplies increasing, but was not affected by [CO 2 ] levels ( Table 2). A similar phenomenon was observed in other reports and our previous works [23,28,30,31,52]. Incorporated with current views in the literature, two possible reasons were usually proposed.…”

“…The beneficial effects of CO 2 enrichment on stimulating plant growth and biomass accumulation of crops have been extensively reported [2,5,6,40]. An increase in the DW ranging from 13.5% to 34.4% has been reported for cucumbers, when [CO 2 ] was elevated to 500-760 µmol mol −1 [1,31,33,41,42], and ranged from 43.9% to 128.0% when [CO 2 ] was elevated to 1000-1200 µmol mol −1 [28][29][30][31]43]. In the present work, in moderate N (N3), the increase in the DW was 30.5% and not significant when [CO 2 ] was elevated to 625 µmol mol −1 , and 29.4% and 68.9% when [CO 2 ] was elevated to 1200 µmol mol −1 , at T1 and T2 stage, respectively ( Table 2).…”

“…In previous studies, we have found the optimum N supply was 7 and 14 mmol L −1 for the seeding and mature plants of cucumber, respectively, and the saturated and semi-saturated [CO 2 ] of cucumber plants under natural solar radiation (about 600 mol m −2 s −1 ) was 1200 and 625 µmol mol −1 , respectively [28,[30][31][32]. Therefore, in this study, we carried out the hydroponic trials on cucumber plants with three [CO 2 ] (400, 625, and 1200 µmol mol −1 ) combined with five N supply levels (2, 4, 7, 14, and 21 mmol L −1 ) during seedling and initial flowering stages.…”

“…Cucumber (Cucumis sativus L.) is globally one of the most important vegetables that prefers to be cultivated in greenhouses with CO 2 enrichment [27]. While the growth, photosynthesis [28], nitrogen metabolism [29], yield [1], fruit quality [30], root morphology [31], root exudate [32], and water use efficiency [33] of cucumber grown in elevated [CO 2 ] conditions have been studied, the effects of different [CO 2 ] and N supply levels on mineral element concentrations in cucumber and the key factor leading to these changes have received far less attention. Moreover, the available information about the optimum N supply under different elevated [CO 2 ] is extremely limited.…”

Nitrogen Fertilizer Levels Affect the Growth and Quality Parameters of Astragalus mongolica

“…Nitrogen fertilizer has been shown to stimulate the increase in yield of different plants [24,39]. According to the findings of the present study, the yield of A. mongolica among the nitrogen fertilizer levels resulted in an M-shaped fluctuating pattern.…”