The Systematic agronomic measures for net OUtpUt value over 3000 per hectare are:N 70.5kg/ha (The ratio of the 3 factors is the same as above), seedling age 27.8 days, N top application 42% of the total.

• 净产值3000/ha以上的综合农艺措施是施纯氮70.；5 kg/ha(三要素比例同上)；苗龄27