论文部分内容阅读
1978年黑龙江省稻区水稻大面积发生历史上少见的倒伏现象。我队地处北纬45度以北,位于呼兰河畔,全年无霜期127天左右,个别低温年仅144天,年平均有效积温2,553℃,属高寒稻区。1978年我队有70—80%的水稻发生倒伏。由于倒伏发生的时期不同,对产量的影响也不同。导致水稻倒伏的因素很多,除品种本身抗倒伏性的强弱外,气象因子与栽培条件也是密切相关的。现将我们的调查观察结果简析如下。一、倒伏原因(一)抽穗授粉期倒伏:去年首批倒伏时间是8月5日,正是水稻抽穗开花授粉期,倒伏是局部的。据调查,如我队科研室种植的北交727,随着氮素肥
In 1978, rice in Heilongjiang Province had experienced a rare phenomenon of lodging on a large area in history. Our team is located north of latitude 45 degrees north, located in the Hulan River, the annual frost-free period of about 127 days, individual only 144 days of low temperature, the average effective accumulated temperature of 2,553 ℃, is an alpine region. In 1978, 70-80% of our team loses their rice. Due to the different periods of lodging, the impact on production is also different. There are many factors leading to lodging of rice. In addition to the lodging resistance of the species itself, the meteorological factors are also closely related to the cultivation conditions. Now the results of our survey is as follows. First, the reasons for lodging (A) heading lodging pollination: Last year, the first batch of lodging time is August 5, it is rice heading and flowering pollination, lodging is partial. According to the survey, such as our team planted North Branch 727, along with nitrogen fertilizer