低磷土壤条件对不同苜蓿品种的生长和磷效率的影响

The growth and phosphorus efficiency of differentalfalfa varieties under low phosphorus

摘要:

为探究不同苜蓿品种对低磷土壤条件的适应性,以甘农3号、甘农5号、甘农9号、甘农10号、WL358HQ、WL343HQ、WL363HQ、WL354HQ、金皇后9个苜蓿品种为研究对象,采用盆栽试验方法,对不同苜蓿品种的株高、生物量、磷含量、磷吸收和利用效率进行了研究,并采用灰色关联度对不同品种苜蓿的表现进行综合评价。结果表明:低磷条件下,结合鲜重和干重,WL343HQ品种生长速度较其他品种快;9个苜蓿品种的磷含量排序为:甘农10号＞WL354HQ＞WL343HQ＞WL358HQ＞WL363HQ＞金皇后＞甘农3号＞甘农5号＞甘农9号;WL343HQ磷吸收效率最高,为1.32 mg/pot,金皇后最低,为0.58 mg/pot,总体表现为WL343HQ＞WL358HQ＞甘农5号＞甘农9号＞WL363HQ＞甘农10号＞甘农3号＞WL354HQ＞金皇后;甘农3号磷利用效率最高,为0.84 g/mg,甘农10号最低,为0.53 g/mg。灰色关联度综合评价得出WL343HQ、WL358HQ、WL354HQ和甘农5号为低磷土壤条件下表现较好的4个品种,适宜在土壤有效磷含量较低的土壤上种植。

Abstract:

Soil phosphorus status is very important to alfalfa growth and nutrient quality.Nine alfalfa varieties (including Gannong 3,Gannong 5,Gannong 9,Gannong 10,WL358HQ,WL343HQ,WL363HQ,WL354HQ and Golden Queen),were used to study their growth and phosphorus efficiency under low soil phosphorus condition using soil pot cultivation method.Plant height,biomass,phosphorus content,phosphorus uptake and utilization efficiency were studied and comprehensive evaluation was conducted.The results showed that plant height,fresh and dry biomass of WL343HQ were greater than the other varieties under low soil phosphorus condition.The phosphorus content of nine alfalfa varieties followed the order of Gannong 10＞WL354HQ＞WL343HQ＞WL358HQ＞WL363HQ＞Golden Queen＞Gannong 9＞Gannong 5＞Gannong 3.The order of phosphorus uptake efficiency was WL343HQ＞WL358HQ＞Gannong 5＞Gannong 9＞WL363HQ＞Gannong 10＞Gannong 3＞WL354HQ＞Golden Queen.WL343HQ had the highest phosphorus uptake efficiency of 1.32 mg/pot while Golden Queen had the lowest(0.58 mg/pot).Gannong 3 had the highest phosphorus utilization efficiency(0.84 mg/pot),while Gannong 10 had the lowest value(0.53 mg/pot).WL343HQ,WL358HQ,WL354HQ and Gannong 5 were four varieties showing better performance under low phosphorus using Grey Correlation Evaluation method,and therefore recommended for planting in soil with low phosphorus.