小议大麻高产栽培技术

大麻（绒麻）是人们生产、生活不可缺少重要物资之一。大麻是一年生草本,高1-3米。根木质。茎直立,具纵沟,灰绿色,密被短柔毛,皮层富含纤维。掌状复叶互生或下部的叶为对生,小叶,披针形至条状披针形,长7-15厘米,先端渐尖,基部渐狭,边缘具粗锯齿,上面深绿色,被短毛,下面淡绿色,密被灰白色毡毛;叶柄长4-14厘米,密被短绵毛;托叶条状披针形,密被短绵毛。花单性,雌雄异株;雄花黄绿色,排列成长而疏散的圆锥花序,花被片5,长卵形,雄蕊5;雌花序短穗状,生于叶腋,绿色,每花外具l卵形苞片,     

红得发紫的蔬菜——紫菜头

紫菜头又名红菜头、火焰菜、根甜菜和红黍菜,为直根系深根性植物.肉质根呈球形,内外均为紫红色,颜色艳丽.肉质根直径5厘米～10厘米,单根重200克左右,纤维少,质柔嫩,茎短缩,到第2年春夏之间抽生花茎,高达130厘米左右.叶卵圆形,有光泽,叶片、叶脉、叶柄及肉质根均是紫红色.圆锥花序,在小穗花序上轮生着3朵～5朵两性花,花小,淡绿色.通过风媒传花授粉,种子肾形,棕色,很小,千粒重13克左右.     

墨西哥玉米栽培、利用技术

(一)生物特征 墨西哥玉米为禾本科蜀黍属一年生草本植物.根系发达,茎杆粗壮,直立丛生,直径1.5～2厘米,高约3米;分蘖力强,每兜可分蘖20～30株;叶片披针形,叶面光滑,茎脉明显;花单性,雌雄同株,雄花顶生,圆锥花序,多分枝;雌花穗状花序,多而小,从单株6节以上的叶丫中生出,每节雌穗1个,每株7～10个,每穗4～8节,每小穗有一小花,授粉后发育成颖果,单穗4～8个颖果,成稀疏串珠状排列;种子长椭圆形,成熟时呈麻褐色,壳质坚硬,千粒重75～80克.     

水翁、海南蒲桃、蒲桃、洋蒲桃

水翁(水泱)桃金娘科常绿乔木,高10~16m。枝下高2~4m,树皮厚,灰褐色,嫩枝压扁或近四棱形;树冠圆形。叶对生,薄革质,长圆形至椭圆形,长8~12cm,宽4~8cm,     

"先锋"高丹草(PaceSetter)农业部"十五"重点推广的优良品种

形态特征 "先锋"高丹草是饲用高粱与苏丹草的最新杂交组合.该品种须根发达,茎高1.8～2.5m,分蘖能力强,叶量丰富,叶片中脉和茎秆呈褐色或淡褐色,疏散圆锥花序,分枝细长;种子扁卵形,棕褐色至黑色,千粒重10～12 g.     

广西珍贵树种高效栽培技术（连载）

非洲桃花心木 非洲桃花心木别名塞楝、仙迦树、非洲楝,为楝科常绿大乔木。树高可达20～30米,胸径2．7米。树冠阔卵形,主干通直圆满。树皮较厚,灰白色。叶子为偶数羽状复叶,长圆形或长椭厕形。花期4～5月,圆锥花序腋生,花朵为黄白色的小花。     

Discovery of and Preliminary studies on a Rapid-Leafing Rice Genotype at the Vegetative Growth Stage

The leafing rates of fourteen rice varieties were measured in a sowing-time experiment, and a rapid leafing genotype at the vegetative growth stage was discovered in an indica variety Yanhui 559. The leaf number on the main culm of Yanhui 559 was always 4-5 leaves more than that of Lemont, and the leafing rate of Yanhui 559 was significantly higher than that of Lemont based on similar growth durations from sowing to heading. Furthermore, the difference of the leafing rate was significant at the vegetative growth stage, but not distinctive at the panicle initiation stage. Genetic analysis of the leafing rates in the two backcross populations of Yanhui 559 and Lemont showed that major and quantitative genes controlled the expression of rapid leafing character. Based on results of investigation for some plants with similar growth durations in the backcrossing populations, the rapid leafing genotypes exhibited earlier tillering and more tiller numbers per plant, and its yield components including the number of panicles per plant and number of grains per panicle were superior to those of the slow leafing genotypes. Further research and application feasibility of the rapid leafing genotype in breeding were discussed.     

黄金树育苗技术

<正>黄金树(Catlapa speciosa ward)紫葳科,梓树属,原产美国中部和东部,近几年在辽宁引种栽培试验成功。黄金树为落叶乔木,高可达30m;单叶对生,叶宽卵形或卵状长圆形,长15～30cm,宽11～20 cm 先端渐尖,基部心形或截形,全缘,表面近无毛,背面密生长弯毛,掌状脉3出,叶柄长10～15cm,稍有毛。圆锥花序顶生, 长约15cm,花冠白色,呈钟状。蒴果长35 ～40cm,径约1.5cm,种子长圆形,长2.5 cm,两端具白色长毛。花期5～6月,果期     

坝上寻芳(上)

盛夏时节,有机会亲近恣意绽放的野花,是多么令人神往的事。塞罕坝是临近北京的一片静谧的宝地,独特的生境孕育了奇异美妙的花草,你不想去看看,顺便让心灵休息一下么?塞罕坝国家森林公园位于河北省最北部。塞罕坝是蒙汉合璧语,意为美丽的高岭。地处阴山山脉和大兴安岭余脉交汇处,这里具有森林-草原交错和高原-     

车轮梅扦插繁殖

<正>车轮梅又名春花木,为蔷薇科石斑木属常绿灌木,是亚热带地区的乡土树种,株高1.2~3.7m,冠幅1.2~3.7m,树冠球形或椭圆形,枝叶浓密,树皮棕褐色到灰褐色。单叶对生,叶革质,形状各异,卵形、矩圆形或披针形,先端短渐尖或略钝,基部狭而成一短柄,叶背网脉明显,叶片光滑,有光泽,暗绿色。伞房花序或圆锥花序顶生,长5~7.5cm,花白色,中心有