摘要
土壤氮、磷、钾养分状况对石灰性土壤地区植物缺铁黄化发生有重要影响。硝态氮通常与重碳酸根共同作用,成为石灰性土壤地区植物黄化的重要原因。磷从土壤、植物两个方面影响铁的移动性,使进入叶绿体的铁数量减少。盆栽试验中,当钾以中性盐的形态供给时,植物的黄化症状减轻,而以磷酸盐或重碳酸盐的形式供给时,植物发生黄化或黄化加重;在水培试验中,当培养液中有重碳酸根存在时,供应非重碳酸盐态钾时,黄化加重。钾素营养影响黄化的机理仍不完全清楚。
Soil nitrogen (N), phosphorus (P) and potassium (K) condition affects plant iron(Fe) deficiency chlorosis differently. Nitrate and bicarbonate coexisting in the calcareous soil are the two most important reasons for plant chlorosis. Phosphorus decreases the mobility of Fe in soil and plant, as a result, less Fe enters the chloroplast. More contradictions exist about the effect of potassium (K) on chlorosis. When K was supplied as a neutral salt in pot experiment, the chlorosis symptom was alleviated, when supplied as a potassium phosphate or potassium bicarbonate, plant chlorosis symptom worsens; in hydroponic culture, when there is bicarbonate in the growth media, non-bicarbonate potassium salt makes plant more chlorotic. The mechanism of K affecting chlorosis is still not clear, as Fe deficiency chlorosis itself.
出处
《西北农业学报》
CAS
CSCD
2004年第1期104-108,共5页
Acta Agriculturae Boreali-occidentalis Sinica
关键词
植物黄化
铁
氮
磷
钾
Plant chlorosis
Iron
Nitrogen
Phosphorus
Potassium
