与小麦相比,大麦生长期短,适宜种植于不甚肥沃的土壤中,亦可种植于降雨稀少且集中的地区.在年降雨量为200-350毫米,而且40%的雨量集中分布在12-2月份(大麦分蘖期)的地中海型气候区,大麦便成了主要谷类作物.在这样的环境条件下,若在大麦播种时大量施氮就会促进早期营养生长,从而导致作物成熟期缺水,影响成穗,容易产生瘪小籽粒.为了避免苗期旺长,部分氮肥应在进一步掌握大麦生长状况之后再施,这样,就得要求对作物需氮进行评估. Compared with wheat, barley has a short growth period, is suitable for planting in less fertile soil and can also be planted in sparsely populated and concentrated areas. At an annual rainfall of 200-350 mm, 40% of rainfall is concentrated in 12 - In the Mediterranean climatic zone of February (barley tillering stage), barley became the major cereal crop under which high levels of N application to barley would promote early vegetative growth, leading to crop maturity Water, affecting the ear, easy to produce deflated small grains.In order to avoid the flourishing seedling stage, part of the nitrogen fertilizer should be further grasp the growth of barley before applying, so, you have to request crop nitrogen demand assessment.