柑桔叶片叶绿素含量的年周期变化及与N含量的关系

作者观察了柑桔叶片叶绿素含量的年周期变化特点。文中分析了不同施N量对叶片叶绿素含量的影响。相关分析表明,施N量与叶片N、叶绿素含量呈正相关;叶片N与叶绿素含量呈正相关。并指出柑桔在谢花以后,促进叶片叶绿素含量的提高对新叶正常转绿的重要性。     

秋蚕用水添食试验初报

今秋蚕期由于长期沒有下雨,天气比較正常但偏干燥,桑叶生长从收蚁当时的偏嫩很快就變为老熱甚至还有硬化黄落的現象,在壮蚕期間是进行各种液体添食的有利条件,我們曾經做过青霉素,高錳酸鉀蔗糖及清水等各种添食,一般只从五龄第一日开始进行,发育正常無显著成效,但使我們最感兴趣的还是利用清水洗滌桑叶稍去水点后进行添食,給桑后直到下次給桑吋间,仍然保持湿状态,不仅大大增     

黑龙江乳牛及黑龙江草原牛生长 发育的初步研究

1.黄白花公犢牛初生重大于黑白花公犢牛,前者为42.3公斤,后者为38.6公斤;母犢牛分别为36.5和36.7公斤,公犢均大于母犢。第一胎犢牛初生重为最小,黑白花公、母犢各为34.9和30.0公斤,黄白花为36.1和33.0公斤;第六胎犢牛初生重最大,黑白花公、母犢各为41.5和40.6公斤,黄白花为46.6和38.7公斤。 2.两类牛体重基本上随着年龄的增加而递增,生后1个月时,体重增长强度为最大(45％以上),3、4个月的絕对增重最高。哺乳期內相对生长随着月龄的增加而递减(13％以上)。断乳时体重黑白花与黄白花母牛各为173.5和169.4公斤,以后的增长緩慢, 并出現不規律的曲綫。黑白花母牛24个月龄时体重,超过黄白花牛同时期的体重。成年母牛各年龄体重均以黄白花牛为大,5岁以上平均为570.5公斤,而黑白花牛为532.6公斤,前者最大体重的年龄为11岁,后者在9岁,黄白花牛比黑白花牛成熟似較晚。 3.两类牛生后体尺的增长,在36月龄前随着月龄的增加迅速上升,其中胸围的增长强度为最大,体长次之,而体高为最小,这个結果与契尔文斯基所提出的生后期体軸骨增长速度大于外周骨的基本規律相符合。黑白花母牛于8岁时体尺增长趋于結束,而黄白花牛概为9岁,前者似較早熟。 4.犢牛初生重大小与母体体重有着显著的相关(γ=0.216,P<0.01);干乳期长短、产乳量多少与犢牛初生重均无相关。初生重大小与1、3、6个月龄增重的相关显著,分別为γ=0.399,P<0.01;γ=0.319,P<0.01;γ=0.282,P<0.05。 5.在低水平飼养条件下,犢牛初生重及其以后各月龄体重均較正常飼养条件下的为低,出現最大初生重的产次为第七产。产乳量多少、干乳期长短与犢牛初生重之间未发現有相关。初生重大小与以后各阶段月龄(1、3、6)增重,同正常飼养条件下一样,有着显著的相关。     

果子園公社桑树上山經驗

安徽省金寨县果子园公社是在大别山区,山多田地少,全社平均每人耕地面积1.14亩。这里是老革命根据地之一。果子园公社,在党的英明领导下,生产大发展,五年来都被评为省一等蚕桑劳模单位(58年光荣的出席全国劳模大会)大大鼓舞了全体社员,积极争取高速度发展蚕桑生产。57年冬和58年春,全县     

馬騾的夜盲症

某部队近几年以来,部分馬騾相继发生夜盲症。1963年5—6月,通过病因調查及采取适当防治措施,已經取得初步防治效果。鑑于家畜的夜盲症較常发生于犢牛、幼駒、仔猪及禽类,在成年馬騾尚属少見,同时,其临床症状亦有所差异,特将其有关情况提出报导如下,供作参考。一、发病情况及原因調查通过普查,获得下列有关資料: (一)发病数量: 于5月20—22日三个夜晚,通过以下几种方法来检查患畜:①高約1米的竹杆横栏;②深約50厘     

馬右側大結腸向左側扭轉一例

馬属动物之腸变位,一般并不多見,而右側大結腸向左側前上方扭轉,則更为稀少,我們于1963年10月13日在南京农院兽医院見到一例,右側大結腸向左側捻轉竟成90度,特此报导如下: 一、病史;某騾車社公馬5岁輓用,长期剧烈使役,飼养及卫生均不十分理想。10月12日下午3时,突然发病,在使役途中出現不安,时臥时起,据駕車員談,間歇期較长,6时勉强回社,疼痛加剧,間歇期縮短,腸蠕动音亢进,在地上連續不断翻滾,当时經該社兽医針灸四蹄穴、三江穴、尾本穴无效,于是又行肌肉注射30%安那尔金15毫升,疼痛仍不止,20分钟后再靜脉注射8%水合     

芽孢桿菌對百合抗灰霉病之抗性誘導

Lily leaf blight,caused by Botrytis elliptica,is an important fungal disease in Taiwan.In order to decrease the disease incidence in Lilium formosanum,the efficacy of application of rhizobacteria for induced systemic resistance(ISR)was examined in this study.Over 300 rhizobacteria were isolated from the rhizosphere of L.formosanum healthy plants and 63 were identified by the analysis of fatty acid profiles.The ability of disease suppression of 13 strains was demonstrated by soil drench application of bacterial suspensions to the rhizosphere of L.formosanum seedlings.Biocontrol experiments were carried out with Bacillus cereus and Pseudomonas putida strains on Lilium Oriental hybrid cultivars Acapulco and Star Gazer besides L.formosanum in the greenhouse and field conditions.The assay with a B.cereus strain good for disease suppression showed that the protection against B.elliptica on L.formosanum could last for at least ten days,consistent with the good association of B.cereus with lily roots.Analysis of the expression of LfGRP1 and LsGRP1,encoding glycine-rich protein of L.formosanum and cv.Star Gazer,respectively,reveals a difference between that in response to the treatment of B.cereus and that singly induced by B.elliptica,suggesting that plant defense responses driven by B.cereus follows a signaling pathway different from that triggered by B.elliptica.According to the results of biocontrol assay and LfGRP1/LsGRP1 gene expression analysis with the culture filtrates of B.cereus strains,we presume that more than one eliciting factor of ISR are generated by B.cereus and some of them exhibit thermostable and autoclave-tolerant traits.This is the first report about ISR-eliciting rhizobacteria and determinants effective for foliar disease suppression on lily.     

芽孢桿菌對百合抗灰霉病之抗性誘導

Lily leaf blight,caused by Botrytis elliptica,is an important fungal disease in Taiwan.In order to decrease the disease incidence in Lilium formosanum,the efficacy of application of rhizobacteria for induced systemic resistance(ISR)was examined in this study.Over 300 rhizobacteria were isolated from the rhizosphere of L.formosanum healthy plants and 63 were identified by the analysis of fatty acid profiles.The ability of disease suppression of 13 strains was demonstrated by soil drench application of bacterial suspensions to the rhizosphere of L.formosanum seedlings.Biocontrol experiments were carried out with Bacillus cereus and Pseudomonas putida strains on Lilium Oriental hybrid cultivars Acapulco and Star Gazer besides L.formosanum in the greenhouse and field conditions.The assay with a B.cereus strain good for disease suppression showed that the protection against B.elliptica on L.formosanum could last for at least ten days,consistent with the good association of B.cereus with lily roots.Analysis of the expression of LfGRP1 and LsGRP1,encoding glycine-rich protein of L.formosanum and cv.Star Gazer,respectively,reveals a difference between that in response to the treatment of B.cereus and that singly induced by B.elliptica,suggesting that plant defense responses driven by B.cereus follows a signaling pathway different from that triggered by B.elliptica.According to the results of biocontrol assay and LfGRP1/LsGRP1 gene expression analysis with the culture filtrates of B.cereus strains,we presume that more than one eliciting factor of ISR are generated by B.cereus and some of them exhibit thermostable and autoclave-tolerant traits.This is the first report about ISR-eliciting rhizobacteria and determinants effective for foliar disease suppression on lily.     

酶法提取稻谷加工副产物碎米中蛋白成分工艺的研究

通过单因素实验和正交实验,用中性蛋白酶水解法对稻谷加工副产物碎米进行了蛋白质的提取研究,得到如下最佳提取条件:酶解时间2.5 h、酶解温度55℃、酶的添加量1.0%(w/w)、液固比10∶1。在此条件下蛋白质的提取率可达74.8%。     

必须重视桔实瘿蚊的防治

桔实瘿蚊(Diplosis SP.)是在我省为害柑桔果实的一种新害虫。1982年前后在雷波县雷马屏地区发现为害,近年尚有扩大蔓延之势,据初步调查,目前已发现该虫在雷波、蒲江、沐川、眉山四个县部分柑桔园发生严重为害。桔实瘿蚊以红色蛆状害虫群集蛀果为