不同养分配比对糯高粱物质生产及氮磷钾利用效率的影响

以糯高粱黔高8号为研究对象,设置不同的氮磷钾配比处理,对糯高粱的物质生产和氮磷钾利用特性进行了研究,结果表明：各施肥处理较不施肥处理糯高粱产量和干物质积累总量均有增加,其中NPK处理最高,分别达到5 972.25和18 076.81kg/hm ²,较对照分别增加16.93%和24.84%,FP处理次之;糯高粱植株氮、磷、钾积累总量NPK处理最大,均与对照差异显著,分别增加32.09%、22.96%和27.13%;成熟期糯高粱的氮磷钾利用效率表现为K>N>P,当季氮、磷利用效率以NPK处理最高,钾利用效率以FP处理最高;糯高粱产量与干物质积累量之间极显著正相关,磷、钾积累总量与糯高粱产量、干物质积累总量呈极显著或显著正相关。本研究基础肥力条件下,限制糯高粱产出的因素是磷和钾。

Effects of Different Nutrient Combinations on Plant Production and Nitrogen,Phosphorus and Potassium Utilization Characteristics in Waxy Sorghum

The waxy sorghum cultivar Qiangao 8 was used as the research object. Plant production and nitrogen utilization characteristics were studied under different nutrient combinations of treatments. The results showed that the yield and total dry matter accumulation of waxy sorghum increased with all treatments than those without fertilization. NPK treatment was the highest one, of which yield and total dry matter accumulation were up to 5 972.25kg/hm ² and 18 076.81kg/hm ², increased by 16.93% and 24.84%, respectively compared with the control followed by the FP treatment. The total accumulation of nitrogen, phosphorus and potassium in the waxy sorghum plants were the highest under the NPK treatment, which were significantly different from the control, increased by 32.09%, 22.96% and 27.13% respectively. Nitrogen, phosphorus and potassium utilization efficiency of waxy sorghum presented tendency of K>N>P at mature stage. Nitrogen and phosphorus use efficiency in NPK treatment was the highest, potassium utilization efficiency in FP treatment was the highest. Correlation between yield and total dry matter accumulation of waxy sorghum was significantly positive. Phosphorus and potassium accumulation among yield and dry matter accumulation of waxy sorghum presented a significant positive correlation. Under these basic fertility conditions, the factors that restrict the output of waxy sorghum were phosphorus and potassium.