酥梨缺铁黄化症发生规律及防治技术的研究

对渭北地区酥梨缺铁黄化症年周期发生规律和自流式树干注射防治缺铁黄化症技术进行了研究。结果表明 ,新梢速生期为黄化症迅速发生期 ,新梢完全停长期为缺铁黄化症的发病高峰期 ;在年周期内 ,防治时间愈早 ,防治效果越好 ;在试验注射量下 ,Fe SO4 以 5 g/ L的浓度为好 ,既能复绿又可避免药害 ;在不同含铁化合物中 ,有机铁、Fe2 +和 Fe3+都有一定的防治效果 ,以 Fe2 +最为理想 ;不同 p H注射液 ,其防治效果差异不明显。

Studies on iron deficiency happenning pattern in pear and its correcting techniques

By means of studying the happenning pattern of pear iron deficiency during a year in Weibei district and its controlling techniques,the results were as followings.The time of new shoot rapid growth was the high happening period and its stop time was the high point of chlorotic grades.The earlier the deficiency was corrcted,the better the effect of regreening was.The 5 g/L FeSO 4 was the best concentration in the test.It could correct the deficiency and avoid injury.Fe 2+ ,Fe 3+ and organic iron compounds all had good effect on correcting iron deficiency,and Fe 2+ compound is the best one.The pH of injecting liquid was not obviously different to correcting iron deficiency.