Effect of soil-applied CaC₂ on gas exchange characters, nitrogen metabolism and fruit yield in cucumber (Cucumis sativus)

Calcium‐Based Sustainable Chemical Technologies for Total Carbon Recycling

“…Paint‐coated CaC 2 (PCC), in combination with fertilizer, was also tested on cucumber plants ( Cucumis sativus ) . It significantly improved the leaf area, fruit yield, carboxylation efficiency, and some other indexes (Table ).…”

“…[203] Paint-coatedC aC 2 (PCC), in combination with fertilizer,w as also tested on cucumber plants (Cucumis sativus). [204] It significantly improved the leaf area, fruit yield, carboxylation efficiency,a nd some other indexes(Ta ble 3). NO 3 À concentration andN 2 Of low increase if urea is added as af ertilizer to improvet he yield of corn.…”

Urea Addition Promotes the Metabolism and Utilization of Nitrogen in Cucumber

“…The growth and development of cucumber are associated with increased nitrogen dependence [1,2]. Nitrogen (N) is an important phytonutrient that is usually required in large amounts, and its deficiency generally limits plant growth and development [3,4]. Thus, N functions as a signaling element that sustains plant growth and development, particularly under stressful conditions [5,6].…”

“…Plants have the ability to take up several chemical forms of nitrogen, and different nitrogen forms have significant effects on the growth of plants [8]. The most common forms of nitrogen are ammonium (NH 4 + ), which has a positive charge; nitrate (NO 3 − ), which has a negative charge; and urea (CO(NH 2 ) 2 ), which has no charge [9]. Due to its inexpensive price and high N content (46% of the mass), urea is the most common N fertilizer used in agriculture worldwide, accounting for approximately 50% of the total world N fertilizer consumption [10].…”

“…Therefore, GS, GOGAT, and GDH are regarded as the main enzymes of nitrogen metabolism in higher plants [14]. However, these three forms of nitrogen undergo different absorption and metabolic processes before they are assimilated into NH 4 + -N. Plants directly assimilate NH 4 + -N into glutamate and indirectly assimilate NO 3 − -N into glutamate by reducing nitrate to nitrite and then to NH 4 + -N and by converting urea to glutamate through urease (Ur), which catalyzes the hydrolysis of CO(NH 2 ) 2 to carbamate and NH 3 and then to NH 4 + -N [15,16]. Nitrate absorption is an active energy-requiring process involving an inverse electrochemical potential gradient [17].…”