【作者】 王刚卫； 王春霞； 田晓莉； 段留生； 何钟佩； 翟志席； 李召虎；

【Author】 WANG Gang-wei, WANG Chun-xia, TIAN Xiao-li , DUAN Liu-sheng, HE Zhong-pei, ZHAI Zhi-xi, LI Zhao-hu (Cotton Research Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China)

【机构】 中国农业大学棉花研究中心中国农业大学农学与生物技术学院；

【摘要】 以5个苗期钾高效型品种和5个苗期钾低效型品种为材料,在营养液培养条件下研究了它们的钾营养特点。结果表明:钾高效品种的钾养分效率、钾吸收效率以及钾利用指数均显著高于低效品种,耐低钾能力也较低效品种显著提高,缺钾症状显著轻于低效品种;高效品种的根长和根系表面积显著大干低效品种,但其不同等级根系所占总根长之比不存在显著差异。根据钾养分效率和对钾的响应度可将供试品种划分为四种类型,即低效高响型、低效低响型、高效低响型和高效高响型,这对棉花生产上品种的选用和钾肥的运筹具有重要的指导意义。更多还原

【Abstract】 This paper compared the characters of potassium nutrition between high-efficient genotypes and low-efficient genotypes under hydroponics condition. The results showed that potassium high-efficient genotypes accumulated significant more dry matter under low K condition and presented significant high absorption ability, high utility, high low potassium-resistance and less potassium-lack symptom, as compared to potassium low-efficient genotypes. The root length and root surface area of high-efficient genotypes were larger than low-efficient genotypes significantly. However, there was no significant difference in the ratio of thin root to whole root between high and low-efficient genotypes. According to the potassium efficient and response to potassium, genotypes could be classed into four types, i. e. low-efficient and low-response, low-efficient and high-response, high-efficient and low-response and high-efficient and high-response. These results could provide guidance for selection of varieties and application of potassium fertilizer in cotton production.更多还原