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Interaction between salinity and crop cycle: effect on yield and quality of lettuce.
No full textThe 55% of groundwater is saline, particularly in arid and semi-arid regions where it is needed most for irrigation.
The aim of this research was to simulate two real conditions: 1) the recent intrusion of sea water into the fresh water table
and 2) the prolonged use of saline water on already salinized soil.
We investigated the effects of salinity on yield, nitrate content, lypophilic, hydrophilic and Vitamin C antioxidant
activity of lettuce.
The lettuce ‘Cambria’ was irrigated with water at five levels of salinity (0.7, 0.9, 1.8, 3.6 and 7.2 dS m-1 ECw)
and two growing cycle were completed (Winter Transplant and Spring Transplant) for evaluating the possible interaction
with salinity.
Salinity reduced yield, fresh weight, and heads diameter and leaf area with more evident damages in winter cycle.
The nitrate content was never higher than European limits and it decreased at increasing salt concentration. The salt stress
didn’t cause an increase of antioxidant activity, but this was higher in the spring cycle, probably due to photo-oxidative
strtyess (high light intensity).
It seems that irrigation with water at EC not greater than 1.8 dS m-1 reduces leaves nitrate content, without to
compromise excessively the yield and nutritional quality of lettuce
Agronomic and environmental benefits of ‘re-using’ a biodegradable mulching film for two consecutive lettuce cycles
Full text linkBiodegradable films are a valuable and sustainable alternative to plastic films for mulching soils since they avoid the environmental and economic problems related to plastic removal and dis posal. Nevertheless, the fast degradation of such materials could make them unsuitable for mid-to long-term use. In a field experiment, the agronomic performance of a biodegradable mulching film (MB) was compared to that of conventional low-density polyethylene (LDPE) film for two consecutive lettuce cycles (winter and spring). In the conditions of this trial, MB showed good resistance to atmospheric agents, with a reduction of its integrity and mechanical properties only after six months. The effects on soil temperature and lettuce yield did not differ from those obtained with LDPE films. The effect on harvest timing was the same as that with LDPE in the spring cycle, while in the winter cycle, the harvest was delayed by about five days compared to LDPE. Mulching films reduced nitrate accumulation in leaves mainly during the winter cycle. However, the effect needs to be further explored with experiments in different pedoclimatic conditions that consider the effects of mulching on nitrification and nitrate-reductase activity that could be affected by changes in soil temperature and moisture
First results on soil Carbon and Nitrogen dynamics in a rotation with fresh-cut leafy vegetables under greenhouse after the amendment by olive husks compost.
No full textDinamica dei nitrati e bilancio della fertilità chimica in un terreno agrario ammendato con compost da F.O.R.S.U. ubicato nella Piana del Sele.
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Effect Of Different Nitrogen Doses On Yield And Quality Of Zucchini Grown In Greenhouse.
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Risposta quanti-qualitativa di quattro cultivar di frumento duro a diverse tipologie di concimazione azotata in un areale tipico della granicoltura campana
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