Efeitos da adubação fosfatada nas relações de interferência inicial entre plantas de milho (Zea mays) e de tiririca (Cyperus rotundus)
Efeitos da adubação fosfatada nas relações de interferência inicial entre plantas de milho (Zea mays) e de tiririca (Cyperus rotundus)
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DOI：
10.1590/s0100-83582006000100005
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发表时间：
2006
期刊：
影响因子：
0.8
通讯作者：
T. P. Salgado;R. Pitelli;P. Alves;F. Salvador;A. S. Nunes
中科院分区：
文献类型：
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作者：
T. P. Salgado;R. Pitelli;P. Alves;F. Salvador;A. S. Nunes
本研究旨在探讨施磷量对玉米与紫色坚果植株间干扰关系的影响。实验在90L罐中进行，罐内装满了沙子、土壤和商业底物PlantMax®的混合物。试验处理为玉米和/或紫色坚果盆栽、紫色坚果块茎初始密度(25或50个/盆)和三个施磷量(增加0、100和300ppm的土壤磷水平)。两种植物间的干扰关系受施磷量的影响。玉米植株对磷肥表现出良好的反应，改善了对紫色坚果植株的干扰，并显著降低了杂草对磷土壤改良剂的反应。玉米干扰降低了紫色坚果枝条和块茎的数量和干物质积累。在玉米干扰下，紫色坚果对块茎的资源分配高于对地上部的资源分配。紫色籽粒干扰降低了玉米株高、叶和茎干物质积累量及叶面积扩展。
The objective of this paper was to evaluate the influence of phosphorus fertilization on the interference relationship between maize and purple nutsedge plants. An experiment was set up in 90L pots filled up with a mix of sand, soil and commercial substrate PlantMax®. The experimental treatments were combinations of pot colonization by maize and/or purple nutsedge; initial density of purple nutsedge tubers (25 or 50 tubers/pot) and three doses of phosphorus fertilization (increase of soil phosphorus level in 0, 100 and 300 ppm). The interference relationships between the two species were affected by phosphorus fertilization. The maize plants showed excellent response to phosphorus fertilization and improved its interference in purple nutsedge plants and drastically reduced the weed response to phosphorus soil amendment. Maize interference reduced the number and dry matter accumulation of purple nutsedge shoots and tubers. Under the maize interference, purple nutsedge showed higher resources partitioning to tubers than to shoots. Purple nutsedge interference reduced maize plant height, dry matter accumulation in leaves and stems and leaf area expansion.