Y两优919是以Y58S为母本，R919为父本选育出的籼型两系杂交水稻品种，本文介绍了其亲本特性以及高产制种技术。Y58S是配合力优良、制繁种产量高的广适型水稻光温敏不育系；R919是抗倒、抗病且配合力强的优势恢复系。Y两优919可在闽西北海拔300～500 m的地区进行烟后制种。高产制种技术包括合理安排父、母本播差期，以父本5月中旬、母本6月中旬播种为宜；选择背风向阳、排灌方便且肥力水平中上的田块作秧田，采用适宜的播种量，药剂浸种消毒，同时施足基肥，适时适量追肥，科学管水和适时防治病虫草害，以培育壮秧；烟叶采收后及时打田除草移栽，设置父母本行比1∶8；大田全生育期做到浅水插秧、寸水返青、薄水分蘖、苗够晒田、寸水孕穗以及干湿壮籽；施足基肥，视秧苗长势适当追肥；根据田间实际情况和当地病虫害测报及时防治纹枯病、稻纵卷叶螟和穗颈瘟等病虫害；该品种制种的理想花期相遇标准以父本始穗期较母本迟2 d为佳，根据田间实际情况及时调整花期；见穗25%～30%时，喷施“九二〇”植物生长调节剂，以确保齐穗和授粉，提高结实率；及时除杂保纯，去除早熟和异形株；拉花结束后及时割除父本，田间90%籽粒黄熟时收割。本文为相关杂交水稻高产制种及推广种植提供参考。

Y Liangyou 919 is an indica two-line hybrid rice variety selected from Y58S as the female parent and R919 as the male parent，the characteristics of its parents and high-yield seed production techniques were introduced. Y58S is a widely adaptable rice photoperiod temperature sensitive sterile line with excellent compatibility and high breeding yield; R919 is a dominant recovery line with lodging resistance, disease resistance and strong coordination force. Y Liangyou 919 can be used for post tobacco seed production in areas with an altitude of 300-500 meters in Northwest Fujian Province. The high-yield seed production techniques includes reasonable arrangement of the sowing time difference between the father and mother plants, with the father plant sowing in mid May and the mother plant sowing in mid June being suitable; choose fields that are windward and sunny, have convenient drainage and irrigation, and have a medium to high fertility level as seedling fields. Use appropriate sowing rates, soak seeds with disinfectants, apply sufficient base fertilizer, and timely and appropriate topdressing. Scientifically manage water and prevent diseases, pests, and weeds in a timely manner to cultivate strong seedlings; after harvesting tobacco leaves, timely plow and weed the fields, and transplant them, with a parent to child ratio of 1∶8; the full fertility period of the field, shallow water transplanting, inch water greening, thin water tillering, sufficient sun drying of seedlings, inch water booting, and dry and wet strong seeds should be achieved; apply sufficient basal fertilizer and apply appropriate topdressing according to the growth of the seedlings; timely prevention and control of diseases and pests such as rice sheath blight, rice leaf roller, and neck blight based on the actual situation in the field and local pest and disease monitoring; the ideal flowering period for seed production of this variety should meet the standard that the male parent’s initial flowering period is 2 days later than the female parent’s, and should be adjusted in a timely manner according to the actual situation in the field; when the number of spikes reaches 25% to 30%, spray “920” plant growth regulator to ensure uniformity and pollination, and improve the fruiting rate; timely remove impurities and maintain purity, eliminate premature and abnormal plants; after the flowering is completed, promptly cut off the male parent and harvest 90% of the seeds in the field when they are ripe. This article provides references for high-yield seed production and promotion planting of hybrid rice.