DIFFERENT SHADING ENVIRONMENTS IMPACT GROWTH AND YIELD OF THREE MINI-TOMATO CULTIVARS

ABSTRACT Our study was conducted in the experimental field of the Department of Technology and Social Sciences (DTCS) of the State University of Bahia - UNEB, Juazeiro-BA. The experimental design was comprised of randomized blocks, sub-subdivided in plots, with four replicates comprising the plots of three different shading methods, gray shading screen (GS), red shading screen (RS), and blue shading screen (BS), and the control treatment with no shading. The subplots comprised three mini-tomato cultivars (“Sweet Million”, “Red Sugar”, and “Shani”), and sub-subplots consisted of seven sampling times. The traits evaluated were: dry matter accumulation in leaves, stems, roots, and fruits, total dry matter, shoot length, root length, total number of fruits, and overall yield. The results of the growth analysis showed that dry matter accumulation in organs of mini tomatoes was similar in all treatments and that the highest total dry matter accumulation occurred under RS. In all treatments, fruit was the preferential drainage; however, the cultivar “Red Sugar” showed higher dry matter accumulation in other plant organs. “Red Sugar” also showed the highest number of fruits per plant; however, when we evaluated total productivity, “Sweet Million” and “Shani” showed similar, higher values than “Red Sugar”.

摘要 本试验于巴伊亚州立大学（State University of Bahia - UNEB）技术与社会科学系（Department of Technology and Social Sciences, DTCS）位于巴伊亚州茹阿泽鲁的试验田开展。试验采用随机区组裂裂区设计，共设4次重复：主区为3种遮阴处理——灰色遮阴网（gray shading screen, GS）、红色遮阴网（red shading screen, RS）、蓝色遮阴网（blue shading screen, BS），以及无遮阴对照处理；亚区为3个迷你番茄品种：'Sweet Million'、'Red Sugar'与'Shani'；亚亚区为7个采样时间点。本试验测定的性状包括：叶片、茎秆、根系及果实的干物质积累量，总干物质重量，地上部长度，根系长度，果实总数及总产量。生长分析结果显示：各处理下迷你番茄各器官的干物质积累量整体相近，其中红色遮阴网（RS）处理下总干物质积累量最高。所有处理中，果实均为植株的优先库器官；但'Red Sugar'品种在其他植株器官中的干物质积累量更高。此外，'Red Sugar'的单株果实数最高，但在评估总产量时，'Sweet Million'与'Shani'的总产量相近且均高于'Red Sugar'。