主題語(yǔ)境
人與社會(huì)——自然科學(xué)研究之偉大成就
背景導(dǎo)入：袁隆平是我國(guó)研究與發(fā)展雜交水稻的開(kāi)創(chuàng)者，也是世界上第一個(gè)成功利用水稻雜種優(yōu)勢(shì)的科學(xué)家，被譽(yù)為“雜交水稻之父”。幾十年來(lái)，他不僅解決了中國(guó)十幾億人口的吃飯問(wèn)題，保證了國(guó)家糧食安全，還為世界糧食供給作出了杰出貢獻(xiàn)。
The third generation hybrid rice (第三代雜交水稻)
The final yield① of the tested variety, G3-1S/P19, came to 1，046.3kg per mu (about 667 square meters), based on two plots of land in Qingzhu Village under the city of Hengyang in central China's Hunan Province.
Experts agreed that the rice has a stout stem (莖稈粗壯), fertilizer tolerance②， lodging resistance③， large spike and more grains.
Unlike the previous④ two generations that required a large amount of water and fertilizers as well as demanding growing conditions and technological support, the third-generation hybrid rice is easier to be cultivated⑤ by ordinary farmers.
One of the most important characteristics⑥ of the third-generation hybrid rice is that it has a shorter growing period. Some previous high-yielding⑦ hybrid rice varieties in China took 160 to even 180 days from sowing⑧ to harvesting, while the figure was shortened⑨ to around 125 days for the new variety.
A shorter growth period can reduce the use of pesticides (農(nóng)藥) and fertilizers, thus reducing cost and improving production efficiency⑩.
China now feeds around 20 percent of the world's population with less than 9 percent of the world's arable land (耕地)．
Yuan Longping, who developed the world's first hybrid rice in the 1970s, has set multiple (混合的) world records in hybrid rice yields in previous years, making great contributions to the food security? of China and the world.
Yuan said：“The third-generation hybrid rice has the comprehensive? strength to promote? a greener and more sustainable? development of China's rice production with higher quality and yield.”
