格药柃扦插繁殖试验

报道了山茶科植物格药柃(Eurya muricata Dunn)的扦插繁殖试验情况。结果表明，格药柃扦插繁殖适宜在春季进行，用50mg／L质量浓度的吲哚丁酸处理，其生根率达到59．5％。     

不同调节剂和管理方式促进马尾松扦插生根试验

马尾松扦插须用生根粉促进生根。在扦插苗生根管理中 ,主要技术环节是保湿。经试验结果表明 ,南京林业大学生根粉及ABT3号生根粉对马尾松穗条扦插成苗率最高达 85 %以上     

影响翅果油树试管苗生根因子的研究

以翅果油树试管苗为试材,研究了影响其生根的一些因子。结果表明:单独使用IBA和NAA时,IBA含量为1.5mg·l-1时的生根率为52%,NAA含量为0.5mg·l-1时的生根率为48%,当IBA和NAA配合使用时,有一定的增效作用,生根率可达56%,最佳浓度配比为IBA1.0+NAA0.05。以蔗糖浓度在25～30g·l-1时,生根效果最理想。     

生长调节剂对芦荟吸枝发根力的影响

芦荟在分株繁殖时，为促进其发根力，迭用ＩＢＡ、ＮＡＡ、ＡＢＴ１及ＩＢＡ高浓度与ＭＳ液混用等处理进行试验，结果表明：取切根短吸枝时，ＩＢＡ浓度５００ｍｇ／１、沾浸时间１０分钟，发根效果最佳，其次是ＡＢＴ、１０ｍｇ／１、３０分钟，ＮＡＡ处理中虽然１００ｍｇ／１、１０分钟发根效果较好，但不如前两者。切根长吸枝以ＩＢＡ１０００ｍｇ／１、１０分钟为宜，其次是ＡＢＴ１２５ｍｇ／１、３０分钟较好。３年生成熟切根插枝则以５０００ｍｇ／１、１０秒钟为宜。当ＩＢＡ与ＭＳ液混用时，以ＩＢＡ５０００ｍｇ／１＋ＭＳ液为宜（上述处理的吸枝阴干时间均为５天）。此外，ＩＢＡｍｇ／１、１０秒钟单用处理发根效果与ＩＢＡ１０００ｍｇ／１＋ＭＳ液及ＩＢＡ３０００ｍｇ／１＋ＭＳ液混用处理基本相似。可见ＩＢＡ与ＭＳ液混用快速沾浸法可以降低成本、省工及操作迅速，因而可减少温度和湿度等环境因素的影响。因此，ＩＢＡ与ＭＳ液混用快速沾浸法酌情应用于芦荟分株繁殖上‘可提高繁殖速度乃至经济效益。     

枸杞外植体生根培养基改良的研究

[目的]探讨枸杞外植体生根培养的最佳配方。[方法]以枸杞新品种宁杞3号离体培养的鲜嫩枸杞苗为研究材料,对常规1/2MS生根培养基的铁元素和有机成分用量增加1倍,配制为改良生根培养基,研究其对枸杞外植体生根培养的效果。[结果]改良生根培养基对宁杞3号外植体生根培养效果非常明显。枸杞外植体的平均生根率在改良生根培养基中为91.7%,而在常规生根培养基中则为65%;接种35d之后,改良培养基上生长的枸杞外植体的平均株高比对照增加了38%,虽然平均根长减少30%,但根粗壮、发达。在改良培养基中培养的枸杞外植体平均单株茎秆鲜重和根部鲜重,分别比常规培养基培养的外植体提高18.1%和8.5%。[结论]改良生根培养基的铁元素和有机养分有利于外植体的生根和成长。     

桂花胚的离体培养

 以不同发育时期的桂花胚为试材, 研究了不同生长调节剂组合、基本培养基、光照时间、蔗糖浓度对离体胚萌发, 以及不同培养基对萌发幼苗生根的影响。结果表明: 诱导胚萌发较理想的培养基为B5 + 6-BA 2.0 mg·L^-1 +NAA 0.1 mg·L^-1 +蔗糖3% ～5% , 光照12 h·d^{- 1} ; 生根较合适的培养基为B5 + IBA 2.0 mg·L ^{- 1} +蔗糖3%。     

马铃薯扦插生根剂的筛选

对CIP(国际马铃薯中心)推荐的改良生根剂A(200 mg/kg IBA+100 mg/kg NAA+175 mg/kg硼酸+20 mL吐温-80, pH=5.5)和自制新型生根剂B(100 g/kg蔗糖+50 mg/kg青霉素, pH=5.5~5.8)、 C(75 g/kg蔗糖+50 mg/kg青霉素+25 mg/kg头孢霉素, pH=5.5~5.8)进行了对比试验,结果表明,自制新型生根剂B较改良生根剂A和自制生根剂C对马铃薯扦插苗的成活率、茎粗以及其它性状具有明显的促进作用.     

Cassava-Based Intercropping Systems on Sumatra Island in Indonesia: Productivity,Soil Erosion,and Rooting Zone

Abstract

In Gunung Batin, the southern end of Sumatra Island, Indonesia, cassava is widely cultivated on gently sloping areas for starch materials. The monoculture system and/or the intercropping system without legume plants commonly adopted in this region may tend to accelerate soil degradation. The objective of this study is to compare the productivity among several cassava cropping patterns to propose the most beneficial one in this region. A field experiment of five cropping patterns {cassava (Manihot esculenta Crantz) single-cropping, three cassava-based intercropping patterns, and a crop rotation} was conducted for three years. The cropping pattern that recorded the highest net income varied with the year. In 1997, the driest year of the past several decades, cassava single-cropping was the highest in income. The proposed intercropping system {cassava/(maize ? soybean ? cowpea)} was the highest in 1998, a year with moderate rainfall. In 1999, when severe insect damage occurred to legume crops, the farmers?conventional intercropping was the highest. In an average of the three years, the proposed intercropping pattern was same as cassava single-cropping, although cowpea cultivation as the dry season cropping was not possible in this region. The amount of soil erosion was relatively high in cassava monoculture in comparison with the other intercropping and crop-rotation systems. Cassava roots penetrated to only 0.5 m deep and extended 1 to 2 m in a horizontal direction depending on the planting density. These results lead to the conclusion that the proposed cassava cropping system would be the most beneficial in terms of economy and control of soil erosion.     

红王子锦带的嫩枝扦插繁育研究

利用快速生根粉、吲哚乙酸、G G R 3种生根剂对红王子锦带插穗进行处理,结果表明,以G G R的100 m g/L溶液进行60 m in生根处理的红王子锦带生根率最高,达92%。嫩枝扦插的繁殖方式可节约成本,缩短生长时间,达到较高的经济效益。     

欧李嫩枝扦插多因素比较试验

对欧李嫩枝扦插关键因素的比较试验结果表明，欧李嫩枝扦播必须带叶；最佳繁育期在5月中旬；ABT1号生根粉浓度在50～100mg／L时，可提高生根率20％以上。