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《Acta Agronomica Sinica》 1983-03
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STUDIES ON THE PROCESS OF INCREASE OF GRAIN WEIGHT IN BARLEY

Gu Zifen Feng Chaonian Zhou Meixue Ji Cheng (Jiangsu Agricultural College,Nanjing,Jiangsu Province)  
In 1981 and 1982,the process of increase of grain weight in 4 differentvarieties(types)of barley was investigated.It was found that the processesof strong-and weak-grains were different among varieties.1.For the strong-grain,the relationship between the filling rate ofgrain Weight and the number of days after heading may be fitted by thesame logistic equation,irrespective of the varieties.For the weak-grain,however,the relationship in different varieties must be described by logi-stic equations with respective parameters.2.According to the characteristics of the process,barley varietiesmay be distinguished as follows:A—synchronous type,H.distichum,in which the process of increaseof strong-grain is in coincidence with that of weak-grain.B—asynchronous type,H.vulgare,the process of strong-grain doesn'tcoincide with that of weak-grain.B_1—slow increase of weak-grain in early ripening stage,loose spikelettype of H.vulgare.B_2—rapid senescence of weak-grain ia late ripening stage,dense spikelettype of H.vulgare.The above-mentioned charactersitics are shown not only under normalgrowing condition,but also at conditions such as spike-shading,leavescutting and cutting-off a part of spikes.It may be ascertained that thedistinctions embody the general idea in biology.3.When the condition is changed,the weak-grain of B type will showthe more adjustable capacity on the weight.
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