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在四年间用428份玉米种子对3种发芽方法(ISTA,标准发芽试验、低温处理发芽试验和田间出苗进行了比较。结果表明:极低温处理发芽试验(8.5℃暗处放置18天后在28.5℃光下放置4天)为田间出苗提供了可靠的预测。在1991年播种后遇到极不适宜的土壤条件,低温处理发芽率与田间出苗相关极显著。在一般情况下,ISTA标准发芽试验和低温处理发芽试验的发芽率与田间出苗相关均不显著。要确保田间出苗好(≥90%),低温处理的发芽率应不低于95%。基于这一结果,品种试验种子用量应确定为要求种植密度的110%～115%。利用低温处理试验可使同一密度的正式品种试验的播种量减少到最小值。在试验研究了对种子进行低温处理的效果(长时间8.5℃低温),用以模拟正式品种试验最差的田间条件,极低温处理试验结果对组织品种试验以防止播种劣质种子是有用的。在这些情况下,低田间出苗率不仅会对种子本身不利,而且会产生边界效应。四年试验对ISTA标准发芽试验、低温试验和田间出苗进行了对比。试验的目的是研究几年来,在比利时这样的栽培玉米条件下几种方法间的相关性。为确保田间出苗,种子播种在连作玉米15年以上的地块。另外一个目的就是推断对应于较差的田间条件下获得较好的田间出苗的低温试验的种子发芽界限值。这一值被确定为90%。而且它是无大风险(密度足够)进行玉米试验的基本条件。
Three sprouting methods (ISTA, standard germination test, low-temperature germination test and field seedling emergence) were conducted with 428 maize seeds over a period of four years.The results showed that the germination test under extremely low temperature (8.5 ℃ in dark place after 18 days at 28.5 ℃ Light for 4 days) provided reliable predictions of emergence in the field.Suitable soil conditions encountered after sowing in 1991, low temperature treatment germination rate and field sprouting related extremely significant.In general, ISTA standard germination test and No significant correlation was found between the germination rate of the germination test and the emergence of the field in the low temperature treatment.The germination rate of the low temperature treatment should be not less than 95% to ensure good emergence (≥90%) in the field.Based on the result, The planting densities should be between 110% and 115% .Using the low temperature treatment test, the sowing amount of the formal test with the same density can be reduced to the minimum.After experimenting on the effect of low temperature treatment on the seeds (8.5 ℃ for a long time) To simulate the worst field conditions for official variety trials, the cryogenic treatment test results are useful for tissue variety testing to prevent sowing of inferior seeds, in these cases low The seedling emergence rate not only detrimental to the seed itself, but also has a borderline effect.A four-year experiment comparing the ISTA standard germination test, the low temperature test and the field seedling emergence test was conducted to study the effect of corn cultivation conditions such as Belgium Correlation of several methods. To ensure field emergence, the seeds were sown for more than 15 years on continuous crop corn. Another purpose was to infer the germination of seeds corresponding to the low-temperature test that gave better field emergence under poor field conditions This value is defined as 90%, and it is a basic condition for testing corn without significant risk (density).