1.栽培方式美国的稻作生产可分为旱播和水播两种。旱播是用播种机将稻种撒播于翻耕过的土壤,适当灌溉使稻种获得必要水分后萌发生长,4～5叶龄后开始灌水,此后继续保持水深约5～16厘米至收割前为止。水播则是将稻种经22～36小时浸种催芽后,以小型飞机撒播于水田,至成熟前整个生育期均保持有水灌溉。无论旱播或水播,均需在成熟收割前2～3周将水排干,以便大型联合收割机的收割作业。在美国,稻作一般于春天播种,晚夏或秋天收获,早熟品种一般于7月或8月初收获后利用其再生能力生产再生稻米,如条件适宜其产量可达正季产量的1/3左右。2.栽培品种美国栽培水稻一般为纯系品种,杂交稻仍属试种阶段。在美国发展杂交稻主 1. Cultivation of rice production in the United States can be divided into two kinds of dry planting and watering. Drought sowing is to use sowing machine to sow the rice in the plowed soil. After proper irrigation, the rice seeds will germinate and grow after necessary moisture. After 4 ~ 5 leaf age, irrigation will be started. After that, the water depth will keep about 5 ~ 16cm before harvest until. Water-borne is the rice seed soaking after 22 to 36 hours of germination, small plane sowing in the paddy fields, until the maturity of the entire growing period to maintain water irrigation. Regardless of dry planting or water sowing, it is necessary to drain the water two to three weeks before the mature harvest for the harvesting operation of the large combine harvester. In the United States, paddy fields are generally sown in the spring and harvested in the late summer or fall. Early-maturing cultivars generally use regenerative rice to produce regenerated rice after harvest in July or early August. . 2. Cultivated cultivars The cultivated rice in the United States is generally a pure line and the hybrid rice is still in the test-cultivating stage. Develop hybrid rice owners in the United States