Soil Texture and Planting Depth Affect Large Crabgrass (Digitaria sanguinalis), Virginia buttonweed (Diodia virginiana), and Cock's-comb Kyllinga (Kyllinga squamulata) Emergence
Soil Texture and Planting Depth Affect Large Crabgrass (Digitaria sanguinalis), Virginia buttonweed (Diodia virginiana), and Cock's-comb Kyllinga (Kyllinga squamulata) Emergence
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DOI：
10.21273/hortsci.48.5.633
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发表时间：
2013-05-01
期刊：
影响因子：
1.9
通讯作者：
Guertal, Elizabeth A.
中科院分区：
文献类型：
--
作者：
Hoyle, Jared A.;McElroy, J. Scott;Guertal, Elizabeth A.
通过温室试验研究了土壤质地和播种深度对大马唐、弗吉尼亚丁香和鸡冠麒麟草出苗的影响。土壤质地包括沙子、壤质沙子和粘壤土，种植深度分别为0、0.5、1、2、4、6和8厘米。出苗率相对于表面出苗率进行了标准化，以便于在测试的杂草物种之间进行比较。杂草种类、种植深度和土壤质地的三向交互作用对出苗没有显著影响。杂草种类与土壤质地、杂草种类与播种深度、土壤质地与播种深度之间存在显著的交互作用。对于所有杂草种类和土壤质地，出苗率随着播种深度的增加而减少，最大出苗率出现在土壤表面。通过回归分析预测了杂草出苗减少50%的播种深度[相对于地表出苗(D-50)]。从最深处(8厘米)长出大马唐，其次是弗吉尼亚丁香(6厘米)和鸡冠花(2厘米)。在3.9、1.1和0.8 cm处分别出现了大马唐、弗吉尼亚丁香和鸡冠花。砂土、壤沙和粘壤土的D-50值分别为0.9、2.3和1.9 cm，持水能力较强的土壤D-50值较高。
Greenhouse studies were conducted to explore soil texture and planting depth effects on emergence of large crabgrass, Virginia buttonweed, and cock's-comb kyllinga. Soil textures examined were sand, loamy sand, and clay loam with planting depths of 0, 0.5, 1, 2, 4, 6, and 8 cm. Percent emergence was standardized relative to surface emergence to allow comparisons among tested weed species. The three-way interaction of weed species, planting depth, and soil texture was never significant for emergence. Significant interactions occurred between weed species and soil texture, weed species and planting depth, and soil texture and planting depth. For all weed species and soil textures, emergence decreased as planting depth increased with the greatest percent emergence at the soil surface. The planting depth at which weed emergence was decreased 50% [relative to surface emergence (D-50)] was predicted by regression analysis. Large crabgrass emerged from deepest depths (8 cm) followed by Virginia buttonweed (6 cm) and cock's-comb kyllinga (2 cm). Large crabgrass, Virginia buttonweed, and cock's-comb kyllinga D-50 occurred at 3.9, 1.1, and 0.8 cm, respectively. Sand, loamy sand, and clay loam D-50 occurred at 0.9, 2.3, and 1.9 cm, respectively, with D-50 higher in the soils with greater water-holding capacity.