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杂交水稻在我省沿淮及淮北地区作单季中稻栽培,经近年试种、示范和推广,增产效果显著.在较好的大田生产条件下,亩产一般可达千斤左右,比同样栽培条件下多本栽插的中籼南京十一号、珍珠矮等常规中稻品种增产2—3成. 杂交水稻具有强大的分蘖能力,这是杂种优势的一个重要表现.据大田调查,在亩栽1.5—2.0万穴,单本栽插条件下,亩产千斤左右的杂交中稻,单株分蘖一般可达15～18个,分蘖成穗率通常为60～70%,每亩有效穗18—22万,分蘖穗占全田总穗数的比重在80%以上,主要依靠分蘖成穗.因此,研究和掌握大田生产条件下杂交中稻的分蘖特点及其合理利用问题,对制定育秧方案、安排栽插密度和运用肥促水控等栽培措施都有重要的指导意义.
Hybrid rice in the province along the Huaihe River and Huaibei region for single-season medium-sized cultivation, in recent years, planting, demonstration and promotion, significant yield increase.Under the conditions of good field production, generally up to about 1000 kg per mu, than the same cultivation conditions Under more intrusive mid-indica Nanjing No. 11, pearl dwarf and other conventional medium-yielding varieties of rice increased by 2-3 percent.Comparative rice has a strong tillering ability, which is an important manifestation of heterosis.According to field survey, planted in acres 1.5 -2.0 million points, under the conditions of single planting, per mu yield of about 1000 kg of hybrid rice, tillers per plant generally up to 15 to 18, tillering spike rate is usually 60 to 70% per acre 18-22 million effective spike , Tillers account for more than 80% of the total spikes of the whole field, mainly depend on the tillering spike.Therefore, to study and master the tillering characteristics of hybrid mid-season rice under the conditions of field production and its rational use of the problem, the development of seedling plan, planted planting Density and the use of fertilizer to promote water control and other cultivation measures have an important guiding significance.