**5. Conclusions**

The successful implementation of conservation tillage in organic vegetable production depends on the local conditions and an adequate managemen<sup>t</sup> to surpass the obstacles that may arise, i.e., weed pressure and soil N shortage. It may, therefore, be di fficult to implement it where there is an initial high weed infestation or where a pronounced spatial variability in soil properties exist that may hinder the growth of the cover crop. Future focus should be on the design of systems that takes into account the choice of resilient productive and allelopathic cover crops, selection of suitable tomato cultivars that may withstand biotic and abiotic stresses, transplantation design (decreasing the distance between rows if possible, double rows) for a better competition with weeds, crop rotations, as well as farm machinery able to perform under no-till conditions to reduce weed pressure whenever it is necessary. Fertilization strategies targeted to supply nitrogen and other nutrients soon after transplantation of field vegetables in no-till soils should also be designed to overcome nutrient shortage due to the reduced mineralization rate and to give advantage to plants over weeds, i.e., via sub fertigation and/or mycorrhizal inoculation.

**Supplementary Materials:** The following are available online at http://www.mdpi.com/2073-4395/9/9/504/s1, Table S1: *p*-values for each of the factors (terms) in the variables measured.

**Author Contributions:** Conceptualization, D.A., C.F., A.P., and M.M.; methodology, D.A.; validation, D.A., M.M., and A.P.; formal analysis, L.M. and L.A.C.; investigation, L.A.C., M.S., D.A., and C.F.; data curation, L.M. and L.A.C.; writing—original draft preparation, L.A.C.; writing—review and editing, D.A., L.M., C.F., M.S., M.M., and A.P.; visualization, L.A.C.; supervision, D.A., M.M. and A.P.

**Funding:** This research received no external funding.

**Acknowledgments:** We would like to thank the sta ff of the Centro di Ricerche Agro-ambientali "Enrico Avanzi" (CiRAA) of the University of Pisa for their help in field and laboratory work. We would also like to thank Giancarlo Colelli and Maria Lucia De Chiara from the University of Foggia for the analysis of tomato fruits performed in the laboratory of the Postharvest Research Unit in the second trial.

**Conflicts of Interest:** The authors declare no conflict of interest.
