High-yield seed production techniques of Y Liangyou 919 hybrid medium indica rice
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.
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