Effect of nicosulfuron on chlorophyll content of marandu-grass cultivated in crop-forest-livestock integration systems

E. Ferreira, M. V. Santos, L. D. Silva, P. Cruz, R. R. Silveira, I. C. Freitas, L. A. Frazão, A. M. Azevedo, Gustavo A. M. Pereira, T. Braz
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Abstract

The aim of this work was to study the effect of sub-doses of herbicide nicosulfuron on the levels of chlorophyll and growth of marandu-grass in an forest-livestock integration system. The treatments consisted of eucalyptus consortium with sorghum (BRS 655 hybrid) and forage Urochloa brizantha cv. Marandu (marandu-grass) at 12×2 and 12×3 m spacings in agroforestry systems, in addition to sorghum + marandu-grass and marandu-grass in monoculture. The doses of nicosulfuron applied at the marandu-grass were 0, 15 and 30 g ha-1. At 30 and 120 days after the application of nicosulfuron, chlorophyll a and chlorophyll b were measured usinf a portable chlorophyll meter, with six measurements per plant. Afterwards, the total chlorophyll content and chlorophyll a/b were calculated. We also measured the mass of the total dry matter of marandu-grass and growth rate of the culture. Marandu-grass plants cultivated in monoculture showed higher quantities of chlorophyll and the highest growth rates. The levels of chlorophyll a, b and chlorophyll a/b and the growth rate of marandu grass were similar between systems integrated with eucalyptus (12x2 and 12x3 m). The increase of herbicide dose negatively influenced on chlorophyll content in marandu-grass in all treatments evaluated. The use of nicosulfuron in doses of 25 and 50 g L-1 reduced the growth rate of marandu grass only when grown in monoculture
硝磺隆对农林牧一体化系统栽培马兰度草叶绿素含量的影响
本研究旨在研究亚剂量除草剂尼科磺隆对林牧一体化系统中马兰度草叶绿素水平和生长的影响。试验处理为桉树与高粱(BRS 655杂交品种)联用和草料乌氏藻(Urochloa brizantha cv)。在农林复合系统中,除了高粱+马兰度草和单一栽培的马兰度草外,还在12×2和12×3 m间距上种植马兰度草。在马兰度草上施硝磺隆的剂量分别为0、15和30 g ha-1。在施用硝磺隆后30和120 d,用便携式叶绿素仪测定叶绿素a和叶绿素b,每株测定6次。然后计算总叶绿素含量和叶绿素a/b。测定了马兰度草总干物质质量和培养物的生长率。单作栽培的马兰度草植株叶绿素含量较高,生长速率最高。叶绿素a、b、叶绿素a/b水平和生长速率在与桉树(12x2 m和12x3 m)组合的系统中基本一致,除草剂剂量的增加对不同处理的马兰度草叶绿素含量均有负相关影响。使用剂量分别为25和50 g L-1的尼科隆,只有在单一栽培中,才会降低马兰度草的生长速度
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