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1978年我所5.8亩汕优二号高产田,亩产1,118斤,比1977年1,224.3斤减产8.7%。我院南湖试验农场,1977年种南优2号、南优6号等杂交稻284亩,获得亩产1,100斤的大丰收;1978年扩大到500余亩,平均亩产下降到900斤左右,约比1977年减产18%。从产量构成因素来看,1978年汕优2号高产田的每亩有效穗数19.95万,每穗结实129粒,千粒重25.7克,空壳率19.92%,与1977年的穗数和成穗率相近,千粒重下降1克,空壳率增高一倍。显然,结实率下降和粒重的减低,是产量不高的重要原因。
In 1978, we had 5.8 mu of high yield farmland of Shanyou No.2, yielding 1,118 kg of mu per mu, down 8.7% from 1,224.3 kg in 1977. In Nanhu Experimental Farm of our hospital, in 1977, 284 mu of hybrid rice such as Nanyou No.2 and Nanyou 6 were obtained, with a bumper crop of 1,100 kg per mu; in 1978, it was expanded to more than 500 mu with an average yield of about 900 kg per mu, About 18% less than in 1977. In terms of yield components, in 1978 the Shanyou 2 high-yielding field per acre 119,900 spikelets per panicle, 129 grains, 1000 grain weight 25.7 grams, 19.92% shell percentage, and in 1977 the number of spikes and ear rate Similar, a grain weight decreased by 1 gram, the shell rate doubled. Obviously, the decrease of seed setting rate and the reduction of grain weight are the important reasons for the low yield.