摘要
为探讨钾用量和留苗株数对玉米苗期生长发育相关指标的影响,在水培条件下,以‘粒收1号’为材料,设置不同钾浓度梯度(K_(1):1.35 mmol/L、K_(2):1.85 mmol/L、K_(3):2.35 mmol/L、K_(4):2.85 mmol/L)和不同留苗株数(D_(1):4株/盆、D_(2):8株/盆),研究玉米苗期株高、茎粗、植株鲜重、根冠比、叶面积以及叶绿素含量对钾浓度和留苗株数的响应。结果表明:施用钾肥对玉米生长有促进作用,在D_(1)处理条件下,植株间竞争小,养分充足,玉米生长更旺盛,所测指标均显著高于D_(2)。随着钾浓度的增加,D_(1)处理条件下,株高、茎粗、叶面积和植株总鲜重均表现为K_(4)最大,K_(1)最小。D_(2)处理条件下,玉米的株高、总绿叶面积和SPAD值表现为K_(2)处理最大,均显著大于其他处理。茎粗、单株生物量、总绿叶面积和SPAD值呈先增加后降低的趋势,K_(2)、K_(3)、K_(4)处理间无显著性差异。分析2处理在不同浓度下的根冠比显示D_(1)处理在K_(1)浓度下根冠比较大,D_(2)处理在中高浓度下较大。
To explore the effects of potassium dosage and the number of remaining seedlings on the indicators related to the growth and development of maize seedlings,under hydroponic condition,we took‘Lishou No.1’as the material,set different potassium concentration gradients(K_(1):1.35mmol/L,K_(2):1.85mmol/L,K_(3):2.35mmol/L,K_(4):2.85mmol/L)and the number of remaining seedling plants(D_(1):4 plants/pot,D_(2):8 plants/pot)to study the response of plant height,stem thickness,plant fresh weight,root-shoot ratio,leaf area and chlorophyll content to potassium concentration and the number of remaining seedlings.The results showed that the application of potassium fertilizer could promote the growth of maize.Under D_(1) treatment,the competition among plants was small,the nutrition was sufficient,and the growth of maize was more vigorous.With the increase of potassium concentration,plant height,stem diameter,leaf area and plant total fresh weight achieved the largest and the smallest values under K_(4) and K_(1) treatment,respectively.Under D_(2),the plant height,total green leaf area and SPAD value of maize were the largest under K_(2) treatment,which were significantly larger than those under other treatments.The stem diameter,single plant biomass,total green leaf area and SPAD value increased first and then decreased,but there was no significant difference between treatment K_(2),K_(3) and K_(4).The root-shoot ratio of D_(1) and D_(2) in different concentrations showed that the root-shoot ratio of D_(1) under K_(1) was relatively high,while that of D_(2) was relatively high in medium and high concentration.
作者
闫艳
徐丽娜
李丽杰
张志勇
Yan Yan;Xu Lina;Li Lijie;Zhang Zhiyong(College of Life Science and Technology,Henan Institute of Science and Technology,Xinxiang Henan 453003)
出处
《中国农学通报》
2021年第35期1-6,共6页
Chinese Agricultural Science Bulletin
基金
河南省科技攻关-农业领域“高密对机收玉米品种根系构型的调控过程及应用”(202102110183)
国家粮食丰产增效科技创新重点专项“玉米密植高产宜机收品种筛选及其配套栽培技术”(2016YFD0300301)
河南省高校科技创新团队支持计划资助“作物根系生物学和绿色高校生产团队”(21IRTSTHN023)。
关键词
玉米苗期
生长发育
钾浓度
水培
maize seedling stage
growth and development
potassium concentration
hydroponics
