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植物生长需要有两大环境因素:来自太阳的热能与光能,称谓“宇宙因素”;另一因素是来自土壤与空气中的,叫“土地因素”,包括养科与水分。目前对于“土地因素”可以充分控制,按照植物需要来供给肥料和水分。但对于“宇宙因素”尚不能全面和完满的加以集中与控制,而是要尽量充分的利用。对大型植株的禾谷类作物说来,如能进行合理的定留苗措施,就可以充分而又经济的利用单位空间中的“宇宙因素”。这一点在玉米看来是可能的,而对密植的玉米说来也是必要的。
Plant growth requires two major environmental factors: heat and light from the sun, the so-called “cosmic factor”; the other is from the soil and air, called “land factors”, including Yang Ke and water. At present, the “land factor” can be fully controlled and fertilizers and moisture are supplied according to plant needs. However, the “cosmic factors” can not yet be fully and completely centralized and controlled, but should be made full use of. For large-scale cereal crops, “cosmic factors” in unit space can be fully and economically exploited if rationing measures are allowed. This is possible with corn, but it is also necessary for dense corn.