Abstract
The experiments were carried out at the Vegetable Research - Development Station Bacau in protected and opeen field crops of pepper – Dariana Bac variety. The study of optical absorption in the 653 nm and 931 nm wavelengths (close to infrared) showed different values of chlorophyll content (CCI) indices, depending on climatic conditions and pepper coating materials. Pepper plants in laboratory conditions, in the sun or in the shade, require artificial lighting, because the chlorophyll content decrease at 9.6-9.7 CCI. The highest chlorophyll content had the pepper plants covered with green textiles (variants 5 and 6), 10.8 CCI, at the sun or in the shade. On the 2nd place was the variant 7 - Plants in shading conditions with black textiles, in the sun with 10.5 CCI. It followed by V8 Plants in shading conditions with black textiles, in the shade with 10.3 CCI. Plants in greenhouse conditions, in the sun and in the shade had the same chlorophyll content, 10.0 CCI. The study of the optical absorption in the 530 nm and 931 nm wavelengths revealed different values of the anthocyanin content indices (ACI), related to the climatic conditions and the cover materials of the pepper crops. The pepper plants in laboratory conditions, in the sun or in the shade, require artificial lighting, because the anthocyanin content being the lowest 3.7-3.8 ACI. The highest anthocyanin content was found in pepper plants covered with black textiles (variants 7 and 8), 4.4 ACI, both in the sun and in the shade. On the 2nd place were the variants 5 and 6 ith 4.1 - 4.5 ACI. Plants in shading conditions with green textiles, in the sun and in the shade had 4.3 ACI. Control variants 9 and 10 (Plants in field conditions, in sun and shade - control) had 10.1 anthocyanin content index. In greenhouse conditions, in the sun and in the shade, the pepper plants had a content of 4.0 ACI.