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Efecto de la frecuencia de defoliación en la producción de materiaseca y contenido de nutrientes de dos especies de Centrosema

机译:落叶频率对两种中心藻的干物质生产和养分含量的影响。

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A trial was conducted to study the effect of three defoliation frequencies, at F1=4, F2=6 and F3=8 -wk intervals, on dry matter yield (DMY), crude protein (CP) and mineral composition of Centrosema macrocarpum Cm and Centrosema pubescens Cp. A split-plot experimental design with species (main plots), defoliation frequencies (subplots) and three replications was used. Samples for each defoliation frequency, corresponding to rainy (RS) and dry periods (DS), were analyzed for CP and calcium (Ca), phosphorus (P), magnesium (Mg), potassium (K), copper (Cu), iron (Fe), and manganese (Mn) concentrations. DMY of Cm (4.4 t ha-1 year-1) was higher (P Cp (1.5 t ha-1year-1). DMY increased (P 1=2.4, F2=2.5 and F3=3.6 t ha-1), whereas CP, ash, and most mineral concentrations were not affected (P>0.5). Only Ca declined (P Cp , P concentrations were higher (P 0.05) by season. Mineral concentrations of the two species were adequate to cover grazing ruminant nutritional requirements with the possible exception of P (0.21%). Forage P concentrations may have been influenced by the low soil P content. Ash and Cu concentrations were lower (P Cm than Cp but CP and mineral composition did not differ between species.
机译:进行了一项试验,研究了三个脱叶频率在F 1 = 4,F 2 = 6和F 3 = 8时的影响-每周间隔,关于毛果粗皮毛Cm和毛细皮粗皮毛Cp的干物质产量(DMY),粗蛋白(CP)和矿物质组成。使用具有物种(主图),脱叶频率(子图)和三个重复的分裂图实验设计。分析了每个下落叶频率对应于雨季(RS)和干旱时期(DS)的样品的CP和钙(Ca),磷(P),镁(Mg),钾(K),铜(Cu),铁(Fe)和锰(Mn)浓度。 Cm的DMY(4.4 t ha -1 年 -1 )较高(P Cp(1.5 t ha -1 year - 1 )。DMY增加(P 1 = 2.4,F 2 = 2.5和F 3 = 3.6 t ha -1 < / sup>),而CP,灰分和大多数矿物质浓度均未受影响(P> 0.5),只有Ca下降(P Cp,P浓度较高(P 0.05),按季节计),这两种物种的矿物质浓度足以除磷(0.21%)外,满足放牧反刍动物的营养要求。草料中磷的含量可能受土壤低磷含量的影响。灰分和铜的含量较低(磷Cm高于磷,但磷和矿物质组成在两者之间没有差异)种类。

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