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首页> 外文期刊>Proceedings of the New Zealand Grassland Association >Performance of setaria in the northern North Island.
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Performance of setaria in the northern North Island.

机译：北岛北部狗尾草的表现。

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摘要

A field experiment was sown with Setaria sphacelata cv. Narok in 1979 and divided in to 8 plots. Two treatments (with or without oats) were randomly allocated within 4 block replicates. Plots were grazed with cattle on 3 d during the year and net herbage accumulation determined to investigate whether a winter oats cover crop could negate the poor persistence and cool-season production traits of S. sphacelata. Oversowing oats into established S. sphacelata increased total winter-spring herbage production, but the use of a cover crop reduced S. sphacelata persistence despite minimum soil temperatures being 1.5degC higher. Starch and soluble sugar levels in 3 different leaf stem fractions of S. sphacelata were low and showed little seasonal variation.S. sphacelata and S. neglecta plants that had survived previous evaluations were transplanted into a field nursery and screened for a further 3 years. Blocks of 4 phenotypically different lines were subsequently established and their performance (herbageproduction and quality) assessed for 2 years. The more productive blocks produced mean annual yields of 12.5 t DM/ha, 60% of this occurring during Jan.-Mar. Herbage quality was assessed as being low to medium, leaf in vitro digestibility and crude protein being 70% and 12% respectively. Within this persistent population, soluble sugars in the basal fractions of the plant were important in assisting cool-season persistence. The place of a C4 grass such as S. sphacelata in farm systems was investigated using the computer model Stockpol. This indicated that a specialist block of S. sphacelata may have merit for the feeding of breeding stock where there is a need to minimize the risk of drought in the northern zones of New Zealand.
机译：用Setaria sphacelata cv进行了田间试验。 1979年将那罗克分为8个地块。在4次重复试验中随机分配两种治疗方法（有或没有燕麦）。在一年中的第3天，用牛放牧地块，并确定牧草的净积累量，以调查冬燕麦覆盖的农作物是否可以消除葡萄球菌的不良持久性和冷季生产性状。将燕麦过度播种到成熟的葡萄球菌中可以增加冬春季牧草的总产量，但使用覆盖作物降低了葡萄球菌的持久性，尽管最低土壤温度高出1.5℃。球形葡萄球菌的3个不同叶茎部分的淀粉和可溶性糖水平较低，并且几乎没有季节性变化。在先前评估中幸存下来的鳞茎和疏螺旋体植物被移植到田间苗圃中，并筛选了另外三年。随后建立了4个在表型上不同的品系的块，并评估了它们的性能（牧草生产和质量），为期2年。高产区块的平均年产量为12.5吨DM /公顷，其中60％发生在1月至3月。草本质量被评估为低至中等，叶片体外消化率和粗蛋白分别为70％和12％。在这种持久的种群中，植物基础部分中的可溶性糖对协助冷季持久性很重要。使用Stockpol计算机模型研究了C4草（如S. sphacelata）在农作系统中的位置。这表明，在需要将新西兰北部地区的干旱风险降至最低的情况下，一个专业的鳞茎链球菌可能具有饲养种畜的优势。

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