友玉12系贵州友禾种业有限公司引进,山西省农科院谷子所开发公司于2003年用自育自交系GF200037作为母本,自育自交系GF99185作父本组配选育而成.2009年通过贵州省农作物品种审定委员会审定,审定编号:黔审玉2009001.该品种生产种植表现高产稳产,抗性较好,适应性广,品质优.

根据玉米种植现状,为寻求紫云县内杂交玉米推广应用的主推品种,进行了玉米新品种试验。结果表明,综合产量、经济性状、生育期等性状,正大818、208-1、正大619、安单3号4个品种组合可作为紫云县的主推品种。

正大619系襄樊正大农业开发有限公司新育成的玉米杂交种.该品种全生育期128 d,株高259.2 m,穗住高104.5 m,穗长21.8m,穗行数13.6行,行粒数42.4粒,果穗筒型,籽粒黄色,硬粒型,青杆黄熟,株型平展.上等肥力地块种植密度为2800株/667 m2,中等肥力地块种植密度为3000株/667 m2.下等肥力地块种植密度3300株/667 m2.正大619是适宜贵州低热河谷区域坡地种植的高产、优质、抗旱耐瘠、耐热、抗病的黄粒玉米杂交种.

The cultivation experiment with zero tillage and rice straw mulch technique was conducted in cultivation of Favorita,a virus-free potato variety with early maturity,in the paddy field to probe the new cultivation model and increase its yield per unit area and economic benefit for raising farmers'income.The results showed that the yield under the zero tillage cultivation technique increases by 224.9 kg/667m2 compared with that under the traditional ridge cultivation model and its increase range is up to 16.2% and the fractional harvest can help big potatoes go on the market early,which can greatly raise its net income(2681.50 Yuan/667m2).