CHEMICAL AGENTS AND SHADING LEVELS FOR THE PRODUCTION OF PEPPER SEEDLINGS

ABSTRACT The aim of this study was to evaluate protected cultivation environments with different levels of shading and application of foliar chemical agents, on growth, photosynthetic pigments and seedling quality of Capsicum frutensens L. The experiment was developed at the State University of Mato Grosso do Sul, University Unit of Cassilândia, with chili pepper. Three cultivation environments (screen of 18, 35 and 50% of shading) and six leaf chemical agents were used [(1) control – without application; (2) Nitrogen (N) 1%; (3) Paclobutrazol 50 mg L-1 + N 1%; (4) Auxin 0.05 g L-1 + N 1%; (5) Gibberellin 0.05 g L-1 + N 1%; and (6) Auxin 0.05 g L-1 + Gibberellin 0.05 g L-1 + N 1%]. Each environment was considered an experiment in which the completely randomized design was adopted and, afterwards, a joint analysis of the same was carried out. The growth and the biometric relations were evaluated. The leaf nitrogen application positively influences the growth and chlorophyll content of pepper seedlings; the application of nitrogen + growth regulator via foliar produces seedlings with higher growth and biometric relations in environments with 50% shading. For the production of seedlings with desirable morphological and physiological aspects, it is recommended to use a foliar application of paclobutrazol + nitrogen in an environment with 50% shading.

摘要 本研究旨在探究不同遮阴水平的保护地栽培环境与叶面化学药剂施用对灌木辣椒（Capsicum frutescens L.）生长、光合色素及幼苗质量的影响。试验于南马托格罗索州立大学卡西兰迪亚校区开展，供试作物为辣椒。试验设置3种栽培环境（分别采用遮阴率18%、35%、50%的遮阴网），并设置6种叶面化学药剂处理：(1) 空白对照（无药剂施用）；(2) 1%氮肥（N）；(3) 50 mg·L⁻¹多效唑（Paclobutrazol）+1%氮肥；(4) 0.05 g·L⁻¹生长素（Auxin）+1%氮肥；(5) 0.05 g·L⁻¹赤霉素（Gibberellin）+1%氮肥；(6) 0.05 g·L⁻¹生长素+0.05 g·L⁻¹赤霉素+1%氮肥。每个遮阴环境均作为独立试验，采用完全随机设计，随后对所有试验进行联合统计分析。本研究测定了植株生长性状与形态计量参数。结果显示，叶面施用氮肥可显著促进辣椒幼苗生长并提高其叶绿素含量；在50%遮阴环境下，叶面配施氮肥与生长调节剂可培育出生长更旺盛、形态计量性状更优良的辣椒幼苗。针对培育兼具理想形态与生理性状的辣椒幼苗的目标，推荐在50%遮阴环境下叶面施用多效唑与氮肥的组合。