苏南稻麦二熟区秸秆全量机械还田技术

采取田间试验和生产调查相结合的方法 ,研究总结了稻麦二熟区秸秆全量机械还田的农机农艺配套技术 ,为稻麦秸秆的农业利用和实现农业生态系统的良性循环提供了新的途径     

Investigation on the contamination of field crops by artificial radioactivities as a result of the H-bomb tests at Bikini Atoll

Introduction

As a result of the H-bomb explosion tests of the U.S.A. in the Southern Pacific Ocean, rain-out in Japan is contaminated considerably by fission products, and field crops also show apparently artificial radioactivities. Many workers are now investigating to clarify degree and regional extent of contamination or sorts of radioactive elements.     

Cutaneous plasmacytoma in three golden hamsters (Mesocrietus auratus)

Spontaneously occurring cutaneous tumours in three golden hamsters were characterized using histological, immunohistochemical and ultrastructural methods. Histologically, the tumours were composed of sheets of round to oval plasmacytoid cells with eccentrically placed nuclei. Tissue sections were weakly positive for anti-B lymphocyte antigen (BLA) staining. Ultrastructurally, large amounts of rough endoplasmic reticulum in the cytoplasm were observed. BLA positivity and characteristics of ultrastructure showed the plasma cell origin.     

甘蔗有性世代主要经济性状的配合力分析

以 6× 3不完全双列杂交 (Nc )衍生的 18个家系实生苗为材料 ,估算了 9个甘蔗亲本的 5个主要经济性状的遗传方差、一般配合力 (gca)和特殊配合力 (sca)效应。结果表明 :茎径和锤度的遗传主要受加性基因效应控制 ,而丛重和丛有效茎数的遗传是基因加性和非加性效应共同作用的结果。根据性状的平均值、一般配合力效应和特殊配合力效应 ,评价了亲本无性系的遗传特点及其在甘蔗杂交育种上的利用价值。以 CP6 5 / 35 7和 CP81/ 12 5 4作为母本能把高糖特性传递给后代 ,崖82 / 96是最理想的父本 ,其杂交后代表现高产、高糖。综合表现较好的组合有 CP6 5 / 35 7×崖 71/374 ,CP6 5 / 35 7×崖 82 / 96 ,CP81/ 12 5 4×崖 84 / 15 3。     

耿氏草属Kengyilia,中国禾本科小麦族一新属

耿氏草属是分布于中国西部的一个新属。它具有S、Y、P染色体组,而与鹅观草属、披碱草属有区别,与鹅观草属和冰草属有密切的亲缘关系。其染色体组构成表明该属起源于四倍体的鹅观草属植物与二倍体的冰草属植物的天然杂交。     

长期施肥对红壤稻田土壤微生物生物量和酶活性的影响

研究长期施肥下红壤双季稻田土壤胞外酶活性(EEAs)变化特征及其主要驱动因子,可为该地区稻田土壤培肥和合理施肥提供理论依据.选择持续了37 a的长期定位试验的不施肥(CK)、化肥(NPK)、高倍化肥(HNPK)和化肥有机肥配施(NPKM)4个处理,采用微孔板荧光法测定了土壤胞外酶活性,分析了土壤化学指标和土壤微生物生物...