土壤适时精准改良,让凤山红灯笼更红了
今年6月下旬,汕尾市城区东涌镇保国荔业种植基地负责人崔保国终于放下心病,灯笼展颜欢笑,土壤这是适时山红因为他今年的凤山红灯笼没再出现黑皮病,真正成为红灯笼了。精准
凤山红灯笼是改良更红原产在保果荔业种植基地的优质晚熟荔枝品种,丰产稳产,让凤果色鲜红,灯笼果肉清甜细嫩,土壤品质优异,适时山红深受欢迎。精准但是,凤山红灯笼对黑皮病敏感,容易在转色后、甚至是采前数天发生黑皮病,果皮出现墨绿色至蓝黑色斑块(当地俗称青蛙皮)(图1),明显影响果实外观,商品价值受损。
2021年崔保国告诉国家荔枝龙眼产业技术体系土肥水管理岗位专家、华南农业大学资源环境研究员姚丽贤,黑皮病病果过冰水后迅速发黑,贮藏性差,不能快递发货。黑皮病成为他种植该品种的最大问题,也是他多年的心病。
2021年凤山红灯笼黑皮病症状
为此,姚丽贤团队采集并测试了该基地的土壤,发现土壤pH为4.33,属于强酸性,而且土壤锰含量丰富,是该基地凤山红灯笼易发黑皮病的主要原因。根据土壤测试及团队近年研究结果,2022年姚丽贤建议该基地在凤山红灯笼末次梢老熟时施用石灰,改良土壤以防控翌年黑皮病的发生。
但是,在2023年6月红灯笼成熟时,发现黑皮病防控效果仍不理想。姚丽贤团队继续深入查找原因。进一步的采样调查分析显示,该基地土壤成土母质主要为花岗岩和砂岩,土壤多粗石砾,质地为砂土,明显有别于华南地区大部分荔枝园土壤为砂质黏壤土的质地(图2)。
而且,该基地地处海边,地下水位埋深浅,去年末次梢老熟时施入的石灰,被降雨淋洗及地下水洗脱,碱性物质很快流失。当年凤山红灯笼果实膨大期根际土壤水分含量高,土壤锰有效性强,难以有效防控黑皮病。
国家荔枝龙眼产业技术体系土肥水管理岗位团队调查和采集荔枝园土壤样本
基于以上分析,2024年5月姚丽贤指导该基地在6月上旬凤山红灯笼转色时再施入碱性的土壤调理剂。该基地凤山红灯笼从6月13日少量开摘,至30日采摘结束,基本未见黑皮病的发生,果实颜色红艳,煞是喜人(图4)。
崔保国开心不已,认为这是他种植凤山红灯笼十多年来果色最最漂亮的一年,商品果率高达98%以上,售价比去年提高1/3。这说明,针对土壤特点及水文条件,对土壤进行适时的精准改良,凤山红灯笼终于成功摆脱了黑皮病的困扰。
凤山红灯笼施用土壤调理剂
2024年凤山红灯笼成熟状
【作者】王志敏
【来源】南方农村报
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