不同种植密度对宁化河龙贡米水稻品种农艺性状和产量的影响

Planting Densities of Helong Rice: Effect on Agronomic Traits and Yield

为了探究不同种植密度对水稻农艺性状和产量的影响,以宁化河龙贡米水稻新品种‘玉针香’、‘农香32’和‘宜优673’为试验材料,设置3种不同种植密度(15万丛/hm^2、18.75万丛/hm^2及22.5万丛/hm^2)的小区试验,研究不同种植密度对水稻生育期、抗病性、植物学性状和产量的影响。结果表明:种植密度高低对水稻生育期和稻瘟病发病率影响不大,高密度种植时水稻纹枯病发病率和有效穗数增加,分蘖数和穗总粒减少;‘玉针香’和‘农香32’在种植密度18.75万丛/hm^2时产量最高,‘宜优673’在种植密度22.5万丛/hm^2时产量最高;3个品种在3种密度组合种植中,以‘宜优673(A3)’×密度B3(丛距20.2 cm)组合产量11.04 kg最高,较其他2个品种相比增产幅度在6%以上。因此,‘宜优673’可作为河龙贡米首选优良水稻品种,种植密度22.5万丛/hm^2为宜。

The paper aims to explore the effect of different planting densities on agronomic traits and yield of rice.The author took new Helong rice varieties (‘Yuzhenxiang’,‘Nongxiang32’and ‘Yiyou673’)as materials,and set 3 different planting densities:15×10^4 bunches/hm^2,18.75×10^4 bunches/hm^2 and 22.5×10^4 bunches/hm^2 to study their effects on growth stage,disease resistance,botanical characters and yield of rice. The results showed that:the planting density had little effect on the growth stage and the incidence of rice blast;high planting density increased the incidence of rice sheath blight and effective panical numbers, decreased the tiller numbers and the total spike grain;‘Yuzhenxiang’and ‘Nongxiang32’had the highest yield at a planting density of 18.75×10^4 bunches/hm^2,and ‘Yiyou673’had the highest yield at a planting density of 22.5×10^4 bunches/hm^2;among the 3 varieties planted at the 3 densities,the combined yield of ‘Yiyou673(A3)’×density B3(the bunch distance between was 20.2cm)was the highest of 11.04kg,and the yield increased by more than 6% compared with the other two varieties.Therefore,‘Yiyou673’is recommended as the preferential variety in Helong rice production with the planting density of 22.5×10^4 bunches/hm^2.