摘要
在石灰性土壤上采用单因子随机区组设计进行了饲用柠条的营养与生长研究。结果显示,施用磷肥的柠条干物质产量、氮(N)磷(P)钾(K)以及钙(Ca)铁(Fe)养分吸收量和粗蛋白产量明显提高;施磷可使柠条叶的N、P、K含量增加以及茎的N、P含量增加,却减少了柠条茎叶中Ca、Fe含量以及茎中K含量。不同施磷水平与干物质产量以及粗蛋白产量之间存在相关性,相关关系均达到显著水平(P<0.05)。施磷可以调节饲喂柠条的Ca/P值,达到家畜日粮的Ca/P标准。结果还表明,180 kg/hm2P2O5是最佳的磷施用量,干物质产量和粗蛋白产量在所有处理中最高,与不施磷对照相比,干物质产量定植当年提高76.5%,第2年提高73.9%;粗蛋白产量当年提高83.97%,定植第2年提高91.05%。同时,该磷用量下柠条的Ca/P较理想。另外,结果分析还表明,柠条单纯作为饲料资源时,建议在养分管理上要隔年施1次磷肥,用量以P2O5180 kg/hm2为准,以满足柠条生长的营养需求和维持柠条的高产稳产。
An experiment using a randomized block design was carried out to explore the effects of applying phosphorous fertilizer on nutrients and yields of Caragana used as forage on calcareous soil.The objective was to provide good nutrient management when Caragana is used as forage to solve the shortage of high quality forage in the Loess Plateau.The dry matter yield,total uptake of nitrogen（N）,phosphorous（P）,potassium（K）,calcium（Ca） and iron（Fe）,and crude protein yield of Caragana per hectare significantly increased after P application.N,P,and K concentration in the leaf as well as N and P concentration in the stem increased after P application.Conversely,Ca and Fe concentrations in leaf and stem and K concentrations in stems decreased after P application.There was a significant（P0.01） positive correlation between P application rate and dry matter yield and crude protein yield of Caragana.Meanwhile,P application can make the value of Ca/P of Caragana reach the standard value for livestock diet.The optimum P rate was 180 kg/ha with dry matter and crude protein yields increased by 76.5% and 84.0% respectively in the first year and by 73.9% and 91.1% in the second year compared with no application of P fertilizer.Based on analysis of the above results,we suggest that P fertilizer should be applied at a rate of 180 kg/ha every other year to maintain the nutrient requirement and stabilize high yield and quality of Caragana when it is used as a forage resource.
出处
《草业学报》
CSCD
北大核心
2010年第2期103-108,共6页
Acta Prataculturae Sinica
基金
农业部948项目"干旱半干旱风沙型盐碱区生态建设关键技术引进"(Z2004-32)
山西省科技攻关项目(051036)资助
关键词
饲用柠条
磷肥用量
柠条营养
石灰性土壤
Caragana as forage plant
phosphorous rates
nutrients of Caragana
calcareous soil
