Table of Content

12 November 1986, Volume 12 Issue 04

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ORIGINAL PAPERS

CANOPY STRUCTURE OF WINTER WHEAT CULTIVARS IN BEIJING AREA

Zhao Shuangning;Li Pei;Zeng Zherong;Tai Jianxiang;Zhuang Qiaosheng

Acta Agron Sin. 1986, 12(04):  217-224. 

Abstract ( 1463 )   PDF (734KB) ( 799 )   Save

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Relationships between yield and its components and structures abovethe top 3 nodes were studied among 22 winter wheat cultivars underhigh yielding conditions in 1983-1985.It was found that yield/head,towhich 1000 kernel weight and kernels/head contributed almost equally,played a more important role than heads/m~2 in determining yield.Thewidth,area and green area duration of flag leaf lamina correlated po-sitively with yield/head,1000 kernel weight and kernels/head but neg-atively with heads/m~2,so that thei...

A REPORT ON THE EXPERIMENT CONTRASTING BETWEEN ROTATION AND CONTINUOUS CROPPING OF TRIPIE CROPPING SYSTEM IN PADDY FIELD IN HUNAN,HUBEI AND JIANGXI PROVINCES

Jiangxi provinces Huang Haoru et al.

Acta Agron Sin. 1986, 12(04):  225-232. 

Abstract ( 1436 )   PDF (431KB) ( 852 )   Save

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The South China is a major producing area of double cropping ofrice.Owing to the continuous cropping of green manure-double croppi-ng of rice carried out in a large area,soil physical-chemical properthad gone bad,secondary gley was aggravated,yields of green manureand double cropping of rice remained stagnant,insect pest and plantdiseases were serious,weeds were spread,as a result the economic eff-ect was lowered.For these reasons,the experiment was conducted in1978～1982 to change the unitary system of cont...

TREND VARIATION AND IT'S CONTROL IN FIELD EXPERIMENT

Mo Huidong;Si Yang

Acta Agron Sin. 1986, 12(04):  233-240. 

Abstract ( 1489 )   PDF (637KB) ( 923 )   Save

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For exploring the trend variation in field experiment,the blank test(BL)and the completely random(CR),the randomized completeblock(RCB),the Latin square(LS)and the p~2 lattice(LA)de-signs were arranged respectively in lowland and upland and the riceand wheat varieties were used as materials.The data obtained wereanalysed by the response surface method.The results showed:1.In all trials,the trend variations were very significant(α>0.01).In blank tests,the proportions of the trend variation SS to thetotal SS ...

CHARACTERIZATION OF ADULT PLANT RESISTANCE OF RICE TO BACTERIAL BLIGHT

Zhang Qi;T.W.Mew

Acta Agron Sin. 1986, 12(04):  241-248. 

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Some varieties showed adult plant resistance to bacterial blight(Xanthomonas campestris pv.oryzae).They were susceptible at seedlingstage but became resistant as plants mature.Among thirteen varieties possessing adult plant resistance to bacte-rial blight,some were resistant to all the four races tested while othe-rs to one or two races only.The adult plant resistance of rice to bac-terial blight seemed to be also race-specific.The disease score in somevarieties decreased gradually from seedling to booting ...

THE CHROMOSOME AND ISOZYME ANALYSIS OF T.MONOCOCCUM

Li Guozheng; Liang Yansheng;Li Guofeng;Jiang Hongru

Acta Agron Sin. 1986, 12(04):  249-254. 

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In this study chromosomal preparations were made by smear methodwith flamedrying and differential stained with Giemsa technique.It wasobserved that the karyotypes of T.monococcum and T.boeoticum werevery similar.Both of them possessed a pair of small satellites and C-bands on centromere regions.However,the intercalary and telomericbands showed some disparity.No significant differences were found ei-ther their peroxidase isozyme patterns or their esterase isozyme pat-terns at early stages of seedling.Thus it...

A PRELIMINARY STUDY ON THE EVOLUTION OF THE MAIN CHARACTERISTICS OF SOYBEANS

Shu Shizhen;Li Fushan;Chang Ruzhen

Acta Agron Sin. 1986, 12(04):  255-260. 

Abstract ( 1483 )   PDF (452KB) ( 1097 )   Save

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The evolution tendency of soybean characteristics from wild speciesto cultivated soybean was studied.Of the three types studied,the se-miwild type was the most variable.Among different characteristics yieldcomponents showed the lower variability with the size of pod,the nu-mber of seeds per pod,and the length of growing period,while therewere big change with the number of pods per plant,the total seed nu-mber,and the weight of seed.Correlation study between different ch-aracters revealed that three types of...

EFFECTS OF COMBINING NATURAL ECOLOGIC FACTORS ON DURATION OF WHEAT IN GUANGDONG

Cai Gisheng;Shi Changjian;Chen Jiawang;Teng Chengye;Lin Kangyou

Acta Agron Sin. 1986, 12(04):  261-268. 

Abstract ( 1637 )   PDF (510KB) ( 822 )   Save

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In this experiment the combination effects of natural ecologic fact-ors in the middle subtropical and south subtropical as well as the northtropical areas of Guangdong on duration of 36 wheat varieties werestudied.The results analysed by two-way variance indicated that bothgenetic and ecologic variation reached the most significant difference.The information offered by 31 progressive regression equations rev-ealed that the most close leading factors related to duration were dailymean temperature and total p...

STUDIES ON INDIGENOUS RICES IN YUNNAN Ⅱ.THE EARLY SEASON KENG RICE IN YUNNAN

K.S.Cheng;X.K.Wang;Y.X.Lu;J.Lou;N.W.Huang;G.R.Liu

Acta Agron Sin. 1986, 12(04):  269-272. 

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In order to elucidate the differentiation of cultivated rice,it isworthy to note whether there is any“early-season”keng rice in Yunnan,since it is generally held that the distribution of early-season kengrice is limited to north parts of the Yangtse River.Our investigationshowed that some upland rice cultivars in Yunnan are of the mid-earlyseason type,and at the same time,there are also some“pseudo-early-season”cultivars grown at high altitudes in northwest Yunnan.Theydiffer from the early-season rice by de...

STUDY ON THE STRUCTURE AND PHOTOSYNTHETIC PROPERTIES OF LEAF BLADES ON DIFFERENT LEVELS IN MAIZE

Wang Qunying;Hu Canghao

Acta Agron Sin. 1986, 12(04):  273-278. 

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The form of mesophyll cells,the distribution of stomatal apparatus,the number of vascular bundles,the content of chlorophyll and thephotosynthetic rate of four leaf blades of different levels of two maize(Zea mays L.)varieties are investigated.Some tendencies of changesare evident.There are various form of mesophyll cells in them;the earleaf being the most complex one with highest proportion of multilinked(more than 4 links)cells;the rest being simpler upward and downw-ard from these.The density of stomata ...

STUDIES ON THE MORPHOLOGICAL AND DURATION CHANGES OF DIFFERENTIATING PANICLES OF BROOM CORN MILLET(PANICUMMILIACEUM)AND THEIR RELATIONSHIP WITH THE OUTER MORPHOLOGY OF THE PLANT

Liu Fuzai

Acta Agron Sin. 1986, 12(04):  279-284. 

Abstract ( 1449 )   PDF (1957KB) ( 852 )   Save

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Panicle-differentiation of the millet are divided into 6 stages accordingto morphological changes.They are:O.differentiation of stems andleaves primordium.Ⅰ.formation of the first primordia.Ⅱ.differentiationof panicle branches.Ⅲ.differentiation of spikelets and florets.Ⅳ.differentiation of stamens and pistil.Ⅴ.differentiation and formationof pollens.Durations of the different stages are affected greatly by the varietiesand the sowing time.It was shown by multiple correlation analysis thatdurations are close...