【摘要】 以内蒙古河套地区非、轻、中、重度盐碱地上种植的初花期(10%植株开花)紫花苜蓿(Medicago sativa L.)进行刈割,设置0～2cm、2～5cm、5～8cm、8～11cm,4个留茬高度。通过测定其草产量及营养指标,旨在研究不同盐碱度对其生产性能及品质的影响。结果表明:(1)中度及重度盐碱地草产量、茎叶比、粗蛋白(CP)、干物质(DM)、相对饲用价值(RFV)均显著低于非盐碱及轻度盐碱(P<0.05),中性洗涤纤维(NDF)及酸性洗涤纤维(ADF)均显著高于非盐碱及轻度盐碱(P<0.05);(2)留茬高度0～2cm、5～8cm、8～11cm,轻度盐碱紫花苜蓿草产量显著高于非、中、重度盐碱(P<0.05);(3)留茬高度0～2cm、2～5cm,轻度盐碱紫花苜蓿茎叶比、DM、CP、RFV值与非盐碱无明显差异(P>0.05)。综合表明,中度及重度盐碱会使苜蓿产量下降,降低植株内营养物质成分。轻度盐碱显著增加了紫花苜蓿草产量。更多还原

【Abstract】 The aim of this study was to research the effects of different saline-alkali(non, light, moderate, heavy) on the growth, yield and quality of alfalfa. Alfalfa was grown in a complete randomized block design with 3 replications in Hetao area of Inner Mongolia in 2018, harvested at the early flowering stage(10% flowering) with four stubble height(0～2 cm, 2～5 cm, 5～8 cm and 8～11 cm).The main results are as follows.(1)The yield, stem-to-leaf ratio, crude protein(CP), dry matter(DM) and relative feeding value(RFV) of moderate and heavy saline-alkali soil were significantly lower than those of non-and light saline-alkali soil(P<0.05), while the neutral detergent fiber(NDF) and acid detergent fiber(ADF) of moderate and heavy saline-alkali soil were significantly higher than those of non-and light saline-alkali soil(P<0.05).(2) Under light saline-alkali soil condition, the yield of alfalfa plants with stubble height of 0～2 cm, 5～8 cm and 8～11 cm was significantly higher than that under non, medium and heavy saline-alkali conditions(P<0.05).(3) There was no significant difference in stem-leaf ratio, DM, CP and RFV of alfalfa plants with stubble of 0～2 cm and 2～5 cm between non-and light saline-alkali soil conditions(P>0.05). In conclusion, moderate and heavy saline-alkali resulted in the decrease of alfalfa yield and nutrient composition, slight saline-alkali significantly increased the yield of alfalfa.更多还原