Acta Agronomica Sinica

Table of Content

12 September 1979, Volume 5 Issue 03

ORIGINAL PAPERS

ON THE ORIGIN,DIFFERENTIATION AND SPREAD OF THE CULTIVATED RICE IN CHINA——AN INVESTIGATION WITH THE CARBONIZED RICE FOUND AT THE HEMUDU EXCAVATION

You Xiu—lin

Acta Agron Sin. 1979, 5(03): 1-10.

Abstract ( 1984 )

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In the winter of 1973,a neolithic relic site was discovered at Hemuduvillage,Yuyao county,Zhejiang Province.This relic site consisted of foucultural layers.The fourth layer,according to a radio—active carbon test,wasformed 6700—6900 years ago.A large number of carbonized rice with anaverage of sev

Original article

A STUDY ON SOME KEY PROBLEMS CONCERNING THE CULTURAL PRACTICES TO ATTAIN THE 1000-GIN PER MU(7.5 METRIC TONS PER HECTARE) LEVEL OF HIGH YIELD FOR WINTER WHEAT

Li Pei—heng;Sun Yi—nan

Acta Agron Sin. 1979, 5(03): 11-22.

Abstract ( 1378 )

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The result of eight years’ study indicated that if the wheat cultivar You—bao was to attain a high yield level of 1000—gin Permu on a large scale,the following key points should be observed.1.The increment of yield level per unit area always involvedtwo stages.In the stage from low to high yield,

ORIGINAL PAPERS

STUDIES ON THE HETEROSIS OF F₁ HYBRIDS IN RICE AND ITS RELATION TO THE PARENTS

Zeng Shi—xiong;Lu Zhuang—wen;Yang Xiu—qing

Acta Agron Sin. 1979, 5(03): 23-34.

Abstract ( 1985 )

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Heterosis,while common in F_1 inter—varietal rice hybrids,variedconsiderably with different characteristics.Among the 13 characteristicsstudied the average heterosis was highest in grain weight per plantfollowed by straw weight per plant and decreased in the followingorder:grain to straw ratio,maxi

THE MORPHOLOGY OF FLORAL ORGANS IN MALE STERILE RAPES,BRASSICA CHINENSIS L.AND B.NAPUS L.

Xu Yi—jun

Acta Agron Sin. 1979, 5(03): 35-42.

Abstract ( 1819 )

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Observations were made on the morphology of floral organs inmale sterile rapes,B.chinensis L.and B.napus L..It was foundthat their floral organs were different in morphology and fertility.On the basis of morphological features,the male sterile plants couldbe classified into six types.The completely

INDUCED MUTATION IN WINTER WHEAT

Ljn Ting-an;Li Chun-Ian;Zhu mie;Zhang Qi-gang

Acta Agron Sin. 1979, 5(03): 43-54.

Abstract ( 1712 )

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Seeds of winter wheat were treated with gamma—ray,ethleneimine(EI)and thermal neutrons,γ—radiation was also applied to spikes ofwheat.The effects of the three different mutagens were compared,and thermal neutron was found more effective for the induction ofmutation.A number of induced mutants wit

STUDIES ON THE BREEDING AND UTILIZATION OF MALE STERILE AND FERTILITY RESTORING LINES IN MAIZE

Ye Shao-wen;Rong Shan;ang Hong-xin

Acta Agron Sin. 1979, 5(03): 55-63.

Abstract ( 1725 )

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A few male sterile plants were found in a maize hybrids intro-duced from Italy in the summer of 1973.They were pollinated bythe sister plants.All plants obtained in the next generation and aftersuccessive back—crosses were proved to be male sterile,while the selfedprog(?)nies of the paternal parent