【摘要】 <正> "75早"是福建师大生物系从"IR8"稻田群体中发现的早熟变异单株,经四年连续选育出的大穗型、中熟偏迟的籼稻中秆品种。因于1975年早季发现,故定名为"75早"。几年来通过各地的试验,表现比"IRS"早熟、省肥和抗纹枯病,具有分孽力强,穗大粒多,出米率高,适应性较广的特点,无论沿海、山区、平原都可种植,稳产高产。受到试种单位的欢迎和好评,种植面积正逐步扩大,本文仅就其种性方面先作初步更多还原

【Abstract】 "EARLY 75" derives its name from the fact that it was first found as single plant of the early-maturing variation in the rice plot of IR8 in the early season of 1975, and its design was finalized after 4 years’ selection. It is an indica rice variety with medium-height, medium to semi-late in ripening, strong in filleting, with big ears and a large number of grains as well as a high rate of rice production after husking. It has a good adaptability and a strong resistance against sheath and culm blight of rice. Its growth period is 127 —130 day for the early season or 108—113 days for the late season. It has a powerful root system, with appropriately spaced plant design, height 90 cm, length of the ear 20—24 cm, with 100—110 grains, 24—25 grams per thousand grains, oval-shaped grain, colourless husk end, short arista, It has a seed bearing rate of 80% and a rice production rate of 74%. It can be grown in plain, coastal as well as mountainous areas. It yields about 6—7.5 tons per hectare—over 7.5 tons at the highest.更多还原