摘要
本文就五个品种小麦对土壤钼的利用和根际土壤申P、K、Mo、Cu、Fe、Zn等对小麦利用土壤钼的影响等问题进行了研究,结果表明:小麦植株含钼量变动在0.3—0.7ppm之间,总趋势是与日递减;不同植株部位Mo平均浓度,就5个品种平均位而言,以旗叶最高,麦秸最低。小麦积累Mo的速率生育期中差异很大,泗阳、宁麦、7959都有两个吸Mo速率高峰,同时出现在4月13日附近和5月12日附近,青农和百农只在5月3日出现了一个高峰。小麦60%的Mo是在最后半个月积累的,全生育期中对土壤有效Mo的最高利用率也仅3%。根际土壤中P能促进小麦对Mo的积累,相关系数r=0.7～.80(n=8),达显著或极显著水平,而根际土壤中K、Cu、Fe与小麦Mo积累呈不同显著程度的负相关,各相关程度因品种而异。体内N、P、K、Zn和Cu与Mo之间都表现极显著的正相关,r=0.571～0.822(n=39),并与Mo浓度始终保持一定比例,大量元素与Mo浓度比约为10,000,Zn约为120,Cu约为20。
Molybdenum contents of 5 winter wheat varieties at 8 different growth stages were investigated regularly for the Purpose of understanding of the utilization of soil available Mo by wheat. Results indicate that plant Mo content ranges from 0.7 to 0.3 ppm in accordance with time and variety, generally tends to decrease with growth age. Two peaks of Mo accumulation were found at around April 13, and May 12 for Shiyang, Nihg—3, 7959 varieties, and one peak was at May 3 for the other two. The highest amount accumulated was about 0.33-0.76g/mu of overground part. Almost 60% of Mo was built up within the last half month. The highest amount of plantutilized Mo commonly accounts for 3% of the total soil available Mo.Rhizosphere P apparently promoted the Mo accumulation in plant. K, Cu, and Fe showed the opposite.Mo appeared to be closely associated with other nutritional elements within plant, with a correlation coefficient r=0.571—0.828(n=39). The ratios of major elements to Mo were about 10000 for the three major elements to Mo, and 130 and 20 for Zn to Mo and Cu to Mo, reapectively.
关键词
小麦
冬小麦
土壤
钼
利用
Soil available molybdenum
Winter wheat
Utilization
Element correlations.
