Abstract
Abstract Sweet potato Ipomoea batatas (L) Lam is a drought resistant species with vigorous growth and high productivity adapted to the conditions of sandy soils (Iamandei Maria et al., 2014, Diaconu Aurelia et al., 2016). In terms of Romania, sweet potato are reproduces by shoots obtained under solar. In this respect, the research carried out at CCDCPN Dabuleni between 2016-2017 aimed at obtaining sweet potato shoots in a trifactorial experience, as follows: Factor A - Planting time in the solar (15 March, 25 March), Factor B - Variety (KSP 1 and KSC 1), Factor C - Diameter of tubers (2, 3, 4 cm). The results obtained on the monitoring of solar microclimate influence on growth and development of sweet potato shoots and plant physiological processes (photosynthesis, perspiration, chlorophyll content) underline the importance of the planting period and the quality of the biological material planted in the solar. Observations and determinations of growth rate they have a slow pace in April, when climatic factors have fluctuated greatly from night to day, which increased in the first decade of May, when the shoots saw the optimal planting size of 35-40 cm. The best results were obtained by planting in the solar on March 25, using tuberous roots 3-4 cm in diameter, when there was an intense physiological activity and a large number of shoots on the tuber (9.125-9.980 shoots).
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