Chormova Dimitra, Kavvadias Victor, Okello Edward, Shiel Robert, Brandt Kirsten
School of Agriculture, Food and Rural Development, Newcastle University, Agriculture Building, Newcastle upon Tyne NE1 7RU, UK.
Department of Soil Science of Athens, Institute of Soil and Water Resources, Hellenic Agricultural Organization DIMITRA, 1 Sofokli Venizelou Str., Lykovrysi-Athens, 14123 Attiki, Greece.
Plants (Basel). 2023 Apr 4;12(7):1553. doi: 10.3390/plants12071553.
Tomatoes ( L.) of the variety Elpida were grown under standard Mediterranean greenhouse conditions during the spring season at three different nitrogen levels (low 6.4, standard 12.8, high 25.9 mM/plant), which were replicated during two consecutive years. Application of high nitrogen significantly increased the colour index a* ( < 0.001) but did not significantly affect yield or quality. The variety exhibited prolonged postharvest storage at room temperature (median survival time of 93 days). The maturation process was delayed by harvest at the breaker stage (2.5 days, ≤ 0.001) or by super-optimal temperatures in the second year of experimentation (10 days, ≤ 0.001). The colour indices L* and a* and the hue angle (a/b*) were positively correlated with the sum of total carotenoids, while differences in b* depended on the year of cultivation. The sustainability of this type of tomato production can be improved by reducing the nitrogen supply to less than the current standard practice, with minimal risk or negative effects on yield and quality of tomatoes.
在春季，将埃尔皮达（Elpida）品种的番茄（L.）种植在地中海标准温室条件下，设置三个不同的氮水平（低氮6.4、标准氮12.8、高氮25.9 mM/株），连续两年重复进行。施用高氮显著提高了颜色指数a*（P<0.001），但对产量或品质没有显著影响。该品种在室温下的采后储存期延长（中位存活时间为93天）。在转色期收获（延迟2.5天，P≤0.001）或在第二年试验中采用超适宜温度（延迟10天，P≤0.001）会延迟成熟过程。颜色指数L和a以及色相角（a/b*）与总类胡萝卜素的总量呈正相关，而b*的差异取决于种植年份。通过将氮供应减少到低于当前标准做法，可以提高这种番茄生产方式的可持续性，同时对番茄产量和品质的风险或负面影响最小。
