盘锦、营口地区水稻综合缺素症发生原因分析

Study on Rice Deficiency Symptoms in Panjin and Yingkou Areas

对辽宁省盘锦、营口地区2001～2002年水稻综合缺素症进行的研究结果表明 ,该地区发生缺素症不同于以往描述的病症现象 ,其发病期在每年的6～7月份。主要症状为初期水稻抽出叶中段出现黄化斑 ,个别发展到叶间和叶基部。为了进一步弄清水稻缺素症发生原因 ,2001年进行田间试验和2002年进行水培试验。在田间试验中 ,对该地区水稻的土样、水样、植物样中的营养元素进行化学诊断。在水培试验中 ,对同一品种水稻进行了形态诊断。通过水培试验验证田间试验的结果 ,该地区主要缺乏B、Zn ,其次缺Fe、Mn。缺素主要原因是6～7月份气温高 ,降雨少 ,土壤pH和HCO3-高及全盐量增加 ,导致Zn、B、Mn。

The rice deficiency symptoms in Panjin and Yingkou areas during 2001-2002. Those deficiency symptoms of rice in the areas were different from those symptoms that described in the past, its illness appears in June and July of every year. The main symptoms could be seen on the original leaves which were cut off and appeared yellow to take spots, even appearing in the middle and bottom of leaf. In order to make clear the reasons of rice deficiency symptoms further more, experiments were conducted in field in 2001 and in water culture in 2002. The trials of field were carried on style chemistry diagnose to the nutrition elements of soil types, rice water, plant of this area. The trials of mineral nutrient were carried on form diagnose to the same kind of rice. The resalts of field were verified through the experiments of water culture.These areas were lack of B, Zn mainly. Secondly Fe, Mn. The main reasons of lacking these elements were the high temperature in June and July, little rainfalls, high soil pH, HCO3-high and the whole salt increasing. Those all lead to the deficiency of Zn, B, Mn, Fe etc.