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近年,日本研究并推行一种新的水稻高产栽培技术,即“V”字理论高产种稻法。这是一种两头“促”、中间“控”、争取穗多粒饱的栽培技术。自松岛、省三等人1966年提出后,日本种植水稻农户开始试用。据统计,1967年日本全国水稻高产竞赛的前5名中有3名,前20名中有12名是用“V”字理论栽培水稻获得高产的。亩产最高获得1,598斤。但是也有失败的,并提出不少问题。“V”字理论高产栽培的要点,松岛连续三年试验证明,水稻出穗前32—33天,大量施硫铵,结实率最低,而在此时期以前或以后施用,结实率就逐渐增高,呈明显的“V”字型,故名“V”字理论。并根据这个理论,采用水稻前期“促”、中间“控”和后期“促”的措施。
In recent years, Japan has studied and implemented a new high-yield cultivation technique of rice, that is, the high-yielding rice method based on the theory of “V”. This is a kind of “promotion” and “control” in the middle, striving for the cultivation of spikes and grains. Since the island of Matsushima, the third class was proposed in 1966, Japan began planting rice farmers trial. According to statistics, in 1967 Japan’s national rice production contest in the top five out of three, the top 20 out of 12 is the use of “V” word theory cultivation of rice for high yield. Yields up to 1,598 kg per mu. But there are also failures and many issues raised. “V” theory of high yielding cultivation points, Songdao three years of trials have shown that 32-33 days before heading out rice, a large number of ammonium sulfate application, the lowest seed setting rate, and in the period before or after the application, the seed setting rate was gradually increased , Was obvious “V” shape, hence the name “V” word theory. According to this theory, we adopted the measures of “promoting” rice in the early stage, “controlling” in the middle and “promoting” in the later stage.