Winter jujube orchard nitrogen （N） management aims at increasing N reserves to meet the tree＇s growth requirements. Fertilization strategies should maximize the efficiency of fertilizers, including the choice of th...Winter jujube orchard nitrogen （N） management aims at increasing N reserves to meet the tree＇s growth requirements. Fertilization strategies should maximize the efficiency of fertilizers, including the choice of the optimal timing of N supply. ^15N-urea was applied to winter jujubes on Jinsixiaozao jujubes rootstock to evaluate the effect of application timing on Nstorage and remobilization in mature trees in pot culture. The treatments consisted of ground application before budding （BB）, during fruit core-hardening stage （FCH）, and fruit rapid-swelling stage （FRS）. Nitrogen-use efficiency of treatments were significantly different, which were 2.42% （BB）, 9.77% （FCH）, and 9.01% （FRS） in the dormant and 5.20% （BB）, 16.16% （FCH）, and 10.30% （FRS） in the following full-bloom. N supply in the pre-harvest helped to increase N-reserves of trees and then translocate to the new growth organs the following year. The largest amount of ^15N was detected in the roots and trunks. In all the treatments, the partition rates were highest in coarse roots, which were 30.43% （BB）, 38.61% （FCH）, and 40.62% （FRS）, respectively. ^15N stored in roots and trunks was used by jujube trees to sustain new growth in the following full-bloom. ^15N applied before budding resulted in lower Ndff% in perennial organs （trunks and coarse roots） sampled in the following full-bloom, but fine roots had highest Ndff% （1.28%）. Other organs recovered similar amount of Ndff%. In contrast, FCH and FRS treatments led to higher Ndff% （4.01-5.15%） in the new growth organs （new growth branches, deciduous spurs, leaves and flowers）, but lower Ndff% in perennial branches （1.49-2.89%）. With the delay of ^15N-urea application time, ^15N increased the partitioning to roots. FCH treatment increased N-storage in perennial organ during winter, which should be remobilized to sustain new growth the following spring.展开更多
该文以冬枣为试材,对其进行不同时间(0、5、10 min)的低温等离子体处理,通过测量处理后冬枣的微生物数量、品质相关指标和采用顶空气相色谱离子迁移谱(headspace gas chromatography ion migration spectrometry,HS-GC-IMS)测量其风味...该文以冬枣为试材,对其进行不同时间(0、5、10 min)的低温等离子体处理,通过测量处理后冬枣的微生物数量、品质相关指标和采用顶空气相色谱离子迁移谱(headspace gas chromatography ion migration spectrometry,HS-GC-IMS)测量其风味物质的变化,探究低温等离子体处理对冬枣贮藏品质和风味物质变化的影响。结果表明,与CK组相比,低温等离子体处理对冬枣表面菌落总数、霉菌和酵母菌总数具有显著的抑制作用,其中70 d时,10 min处理组和5 min处理分别比CK组菌落总数低0.6 lg CFU/g和0.39 lg CFU/g;分别比CK组霉菌和酵母菌总数低0.42 lg CFU/g和0.28 lg CFU/g。低温等离子体处理可以减缓冬枣呼吸强度的升高,缓解可溶性糖含量、可滴定酸含量和维生素C含量的下降;抑制冬枣硬度的降低,其中,5 min处理组效果最为显著,冬枣硬度在第70天时5 min处理组比CK组升高47%;5 min处理组冬枣中原果胶含量比CK组高43%,可溶性果胶含量比CK组低55%,纤维素含量和半纤维素含量也分别比CK组高14%和74%。HS-GC-IMS结果分析表明,贮藏后期5 min处理组中2,3-丁二酮、2-苯基乙醛、柠檬烯、己酸等物质含量高于CK组和10 min处理组,但处理组中2,3-丁二酮和2,5-二甲基吡嗪含量低于CK组。综合分析表明,低温等离子体处理对抑制采后冬枣品质劣变及风味物质变化具有积极作用。展开更多
以鄂北冬枣为试验材料,研究0、500、1 000、1 500 n L/L浓度的1-MCP对鄂北冬枣贮藏过程中果实品质的影响。结果表明:1-MCP冷藏处理能够明显抑制果实的腐烂,延缓果实硬度,可溶性固形物含量、VC含量及可滴定酸含量降低,并能减缓果实水分...以鄂北冬枣为试验材料,研究0、500、1 000、1 500 n L/L浓度的1-MCP对鄂北冬枣贮藏过程中果实品质的影响。结果表明:1-MCP冷藏处理能够明显抑制果实的腐烂,延缓果实硬度,可溶性固形物含量、VC含量及可滴定酸含量降低,并能减缓果实水分散失。综合来看,以500 n L/L处理对维持冷藏期间果实的保鲜效果较好。展开更多
文摘Winter jujube orchard nitrogen （N） management aims at increasing N reserves to meet the tree＇s growth requirements. Fertilization strategies should maximize the efficiency of fertilizers, including the choice of the optimal timing of N supply. ^15N-urea was applied to winter jujubes on Jinsixiaozao jujubes rootstock to evaluate the effect of application timing on Nstorage and remobilization in mature trees in pot culture. The treatments consisted of ground application before budding （BB）, during fruit core-hardening stage （FCH）, and fruit rapid-swelling stage （FRS）. Nitrogen-use efficiency of treatments were significantly different, which were 2.42% （BB）, 9.77% （FCH）, and 9.01% （FRS） in the dormant and 5.20% （BB）, 16.16% （FCH）, and 10.30% （FRS） in the following full-bloom. N supply in the pre-harvest helped to increase N-reserves of trees and then translocate to the new growth organs the following year. The largest amount of ^15N was detected in the roots and trunks. In all the treatments, the partition rates were highest in coarse roots, which were 30.43% （BB）, 38.61% （FCH）, and 40.62% （FRS）, respectively. ^15N stored in roots and trunks was used by jujube trees to sustain new growth in the following full-bloom. ^15N applied before budding resulted in lower Ndff% in perennial organs （trunks and coarse roots） sampled in the following full-bloom, but fine roots had highest Ndff% （1.28%）. Other organs recovered similar amount of Ndff%. In contrast, FCH and FRS treatments led to higher Ndff% （4.01-5.15%） in the new growth organs （new growth branches, deciduous spurs, leaves and flowers）, but lower Ndff% in perennial branches （1.49-2.89%）. With the delay of ^15N-urea application time, ^15N increased the partitioning to roots. FCH treatment increased N-storage in perennial organ during winter, which should be remobilized to sustain new growth the following spring.
文摘该文以冬枣为试材,对其进行不同时间(0、5、10 min)的低温等离子体处理,通过测量处理后冬枣的微生物数量、品质相关指标和采用顶空气相色谱离子迁移谱(headspace gas chromatography ion migration spectrometry,HS-GC-IMS)测量其风味物质的变化,探究低温等离子体处理对冬枣贮藏品质和风味物质变化的影响。结果表明,与CK组相比,低温等离子体处理对冬枣表面菌落总数、霉菌和酵母菌总数具有显著的抑制作用,其中70 d时,10 min处理组和5 min处理分别比CK组菌落总数低0.6 lg CFU/g和0.39 lg CFU/g;分别比CK组霉菌和酵母菌总数低0.42 lg CFU/g和0.28 lg CFU/g。低温等离子体处理可以减缓冬枣呼吸强度的升高,缓解可溶性糖含量、可滴定酸含量和维生素C含量的下降;抑制冬枣硬度的降低,其中,5 min处理组效果最为显著,冬枣硬度在第70天时5 min处理组比CK组升高47%;5 min处理组冬枣中原果胶含量比CK组高43%,可溶性果胶含量比CK组低55%,纤维素含量和半纤维素含量也分别比CK组高14%和74%。HS-GC-IMS结果分析表明,贮藏后期5 min处理组中2,3-丁二酮、2-苯基乙醛、柠檬烯、己酸等物质含量高于CK组和10 min处理组,但处理组中2,3-丁二酮和2,5-二甲基吡嗪含量低于CK组。综合分析表明,低温等离子体处理对抑制采后冬枣品质劣变及风味物质变化具有积极作用。
文摘以鄂北冬枣为试验材料,研究0、500、1 000、1 500 n L/L浓度的1-MCP对鄂北冬枣贮藏过程中果实品质的影响。结果表明:1-MCP冷藏处理能够明显抑制果实的腐烂,延缓果实硬度,可溶性固形物含量、VC含量及可滴定酸含量降低,并能减缓果实水分散失。综合来看,以500 n L/L处理对维持冷藏期间果实的保鲜效果较好。
