提前“两步走”,华农专家助力农户打赢柑橘冻害保卫战
近日,广东省农村科技特派员、专家助力战副教授何晓芳组织专家团队,农户再次前往东陂镇、打赢冻害香花镇等沃柑种植基地开展预防冻害调研行动,柑橘为新一轮降温提前防寒做好预防。保卫近几年沃柑效益增长,两步走加上有较长的提前采果期,成为柑橘种植户们的华农新宠。
据了解,专家助力战每年的农户12月下旬,沃柑开始进入采摘期,打赢冻害来年3-4月是柑橘沃柑市场价格最好的季节,所以不少果园会将沃柑留树保鲜到清明前后才最后摘完上市,但冬季冻害是粤北地区沃柑成熟期遇到的最大自然灾害。2022年2月,一场突如其来的大幅度降温,把所有留树保鲜的沃柑都冻坏了,果农们心痛不已,全年的心血也是血本无归,仅香花镇的果园就亏损80万元。
去年至今,农村科技特派员团队充分与东陂镇柑橘种植户紧密对接,根据天气变化情况,实行提前采摘拓宽市场、提前盖膜防冻害的“两步走”措施,预防低温灾害。在2023年刚过去的最后一个月,“最冷冬至”降临广东,多地最低气温“冷到破纪录”,粤北的清远连州更是出现寒冷红色预警。根据省气象局信息,新一轮的降温已经开始,粤北平均气温下降8℃到10℃,最低气温-2℃,高寒山区-5℃的雨雪天气。面对接二连三的持续低温,农村科技特派员带着柑橘种植户,一起打赢了这场柑橘冻害保卫战。
“有了专家们两步走的办法,今年可以安安心心过一个好年,明年更有信心放开手脚种沃柑了。”即使在今年反常提前降温,而且持续低温天气条件下,连州市茂丰源农业科技有限公司果园主曾卫光显得更淡定、更自信。果园果农们悬在心上的“石头”落地了,露出满意的笑脸。现在,大部分没有盖膜的果园已经提前完成采摘,并远销江浙地区走进长三角的市场。而覆盖薄膜的片区,完全不受冻害的影响,金黄色的沃柑压满枝头,这种采用盖膜办法留树保鲜的果园,最大限度把新鲜的果实留到清明前后,卖到更好的价格。
果园大部分已经完成采摘(上图)及采取盖膜防冻留树保鲜(下图)
沃柑防冻妙招
目前正值砂糖橘、沃柑采摘期,如何对抗低温,粤北果农应该注意以下几点:
1、在霜冻到来前1-2天放水进沟,保持土壤湿润或者沟底有水,将土壤湿透以提前吸收和保存能量。
2、在最低温度达到-2℃以下时,下半夜在橘园堆火熏烟,使其产生大量烟雾,增加橘园温度、预防辐射霜冻的发生。
3、冰冻后出现的白天晴空万里、夜晚低温辐射霜冻的天气是柑橘最容易造成严重冻害的时期。此时要及时淋水洗霜或人工除霜,减轻危害。并且做好冻后恢复措施,包括剪除受冻枝条、枯叶和病枝病叶,集中销毁。等气温稳定回升后,树盘深翻土壤,切断土壤毛细根,阻止水分蒸发,增加土壤氧气,促进根系呼吸,迅速提高土壤温度。
【来源】南方农村报
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