Potash can be applied at up to 100 kg/ha and repeated every 2-4 years and more frequently where potassium deficiencies have been observed. Sulphate of potash硫酸钾, or a mixed product containing this, is the preferred form of potash 2020/9/17 fertiliser.
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Molybdenum
Molybdenum deficiency is common on slightly acid soils and may be corrected by applying molybdenized superphosphate (0.02 %) every third year. Where needed, apply at 100 g/ha every 3-4 years. It is mainly required on acid soils. This amount of Mo will be supplied in 250 kg/ha of Superphosphate Mo 400.
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田间管理
防除杂草
也可使用化学除莠剂如普施 特、拿捕净、盖草能、禾草克等 进行化学除草。
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田间管理
追肥
苜蓿喜肥，每生产10t干草， 需从土壤中吸收186kg的氮、 18.6kg的磷和10kg的钾。
为保证苜蓿高产稳产，施肥 是关键。
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田间管理
苜蓿的根瘤菌能固定氮素，除 在播种之前施入少量氮肥以满足幼 苗对氮的需求外，在一般情况下不 施氮肥 。
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Nitrogen
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田间管理
施用磷、钾肥可显著增加苜蓿的 产量，并可提高粗蛋白质含量。但钾 肥对苜蓿的效果仅在施用的当年，第 2年效果不明显，磷肥施用量过高， 还有降低草产量的趋势。
第五章 豆科牧草
第一节 苜蓿属牧草
一、紫花苜蓿 二、金花菜 三、黄花苜蓿
第二节 其他豆科牧草
2020学特性 （四）栽培技术 （五）收获利用
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（四）栽培技术 选地
品种选择
栽
轮作和整地
培
技 播种
术
田间管理
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Copper
Symptoms of copper deficiency include wilting and downward curling of the youngest leaves, faded凋落 graygreen colored foliage叶 and short, bushy 浓密plants. 10 kg/ha of copper sulphate every 5 years is used to correct copper deficiency on most soils, but 20 kg/ha may be required on organic soils.
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Phosphorus
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12-40 kg P/ha (130-350 kg superphosphate过磷酸钙 /ha) at sowing. 12-24 kg/ha (130-260 kg superphosphate过磷酸钙/ha) annually.
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Potassium
Alfalfa shoot exhibiting the marginal chlorosis spot20t20i/n9/17g indicative of K deficiency
Potassium
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Potassium
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Potassium
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Boron
Boron deficiency symptoms are similar to sulfur deficiency, with yellowing of the youngest leaves occurring in deficient plants. Boron deficiency may be overcome by applying 4 kg/ha of borax （硼砂）every 2-3 years. 2020/9/17
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Sulphur
12-40 kg/ha annually (or as gypsum石膏 pre-plant at 1 t/ha, which is cheaper). This can be applied as single super on phosphate - deficient soils, or as gypsum on soils where phosphorous levels are already adequate.
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田间管理
防除杂草
苜蓿田的杂草防除应采取综合 措施： 播前要精细整地，清除地面杂草； 其次要控制播种期，如东北6月播种、 河南早秋播种可有效抑制苗期杂草；
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田间管理
防除杂草
第三可采取窄行条播，使苜蓿尽 快封垄；
第四进行中耕，在苗期、早春返 青及每次刈割后，均应进行中耕 松土，以便清除杂草，疏松土壤， 防止水分蒸发，促进苜蓿的生长；
Magnesium
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Sulphur
Sulfur deficiencies in Saskatchewan usually occur on coarse-textured （ 砂 质 土 ） or peaty soils（泥炭土）, but are becoming more common on other soil types, so it is good management to check the sulfur status of alfalfa fields regardless of the soil type. Symptoms of sulfur deficiency include stunting （ 发 育 受 阴 ） of plants and yellowing of youngest leaves and veins（叶脉）.