By the field experiment,we set up the treatments of non-application of potash fertilizer,conventional fertilization,balanced fertilization and halved application of potash fertilizer,and studied the effect of differen...By the field experiment,we set up the treatments of non-application of potash fertilizer,conventional fertilization,balanced fertilization and halved application of potash fertilizer,and studied the effect of different treatments on rice yield and soil nutrient content. The results showed that compared with non-application of potash fertilizer,conventional fertilization and balanced fertilization significantly increased the spike length,thousand kernel weight,yield and total potassium content of the stalk,as well as soil organic matter,total nitrogen and available phosphorus content; compared with conventional fertilization,the balanced fertilization did not significantly increase the rice growth and yield,but effectively increased rice grain total nitrogen,stalk total nitrogen and total phosphorus content,as well as soil available phosphorus and available potassium content. It could be found that potash fertilizer played a certain role in increasing rice yield and soil nutrient content,and the balanced fertilization had the most significant effect.展开更多
The increase of the potash fertilizer dose in-duced a raise in efficiency influence of the ni-trogen fertilizer, optimisation of phosphorous fertilizer effect, enhancement of leaf protein production, expansion of assi...The increase of the potash fertilizer dose in-duced a raise in efficiency influence of the ni-trogen fertilizer, optimisation of phosphorous fertilizer effect, enhancement of leaf protein production, expansion of assimilating surface and yield growth. In the period of yield forma-tion, the parameters of delayed fluorescence of chlorophyll (DF) of leaf wholly corresponded with key factors that had a dramatic influence on the effectiveness of yield formation. The maximum level of DF amplitude mostly de-pended on the activity of nitrogen metabolism and presumably on active PSII concentration changes per square unit. Half-decay time of this amplitude was predominantly identified by the level of carbohydrate metabolism in the overall plant system, including the quantity of its products and, therefore, mostly by correspon-dence with yield. This is a biological base trig-gering the use of DF parameters for system analyses of plant production process.展开更多
Chemical fertilizers,such as potash,have a strong tendency to cake when exposed to humidity.In this work,a novel synchrotron-based X-ray tomography 3D-imaging technique was for the first time employed to investigate t...Chemical fertilizers,such as potash,have a strong tendency to cake when exposed to humidity.In this work,a novel synchrotron-based X-ray tomography 3D-imaging technique was for the first time employed to investigate the solid bridge formation from 2D and 3D perspectives.Image processing and a theoretical model were presented to demonstrate recrystallization near contact points between potash particles during a conventional drying process.The effect of initial moisture content on the water activity of surface surrounding the contact points was investigated.The results showed that by increasing the moisture content of particles(3%–5%),the dissolution of sylvite increased and the solid bridge length between potash particles was enlarged from 28μm to 44μm due to supersaturation conditions.In addition,the external porosity of potash particles at the end of drying process decreased from 25.3%to 19.5%for 3%and 5%moisture content,respectively.展开更多
钾肥对作物生长与土壤供钾水平有重要作用。为了研究新型钾肥对作物生长影响,将新型钾肥材料设计处理Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ6个不同施钾量水平(0、75、150、225、300、375 kg K_(2)O·hm^(-2)),对鲜食玉米的生长、产量以及肥料效...钾肥对作物生长与土壤供钾水平有重要作用。为了研究新型钾肥对作物生长影响,将新型钾肥材料设计处理Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ6个不同施钾量水平(0、75、150、225、300、375 kg K_(2)O·hm^(-2)),对鲜食玉米的生长、产量以及肥料效果进行系统研究。结果表明:处理Ⅳ(225 kg K_(2)O·hm^(-2))的玉米长势最好;处理Ⅴ(300 kg K_(2)O·hm^(-2))在玉米籽粒、根茎叶等干物质量及钾素吸收量方面均表现最好;处理Ⅳ钾素利用率最高,为58%。在土壤钾素供应方面,土壤当季供钾水平(速效钾)和供钾潜力(缓效钾)均为处理Ⅵ(375 kg K_(2)O·hm^(-2))最高,处理Ⅳ次之。综合来看,处理Ⅳ(225 kg K_(2)O·hm^(-2))对鲜食玉米的整体生长及土壤钾素供应表现最佳。展开更多
基金Supported by Open Fund of Key Laboratory of Zhejiang Subtropical Soil and Plant NutritionZhejiang"SanNongLiuFang"Scientific and Technological Cooperation Project in 2016
文摘By the field experiment,we set up the treatments of non-application of potash fertilizer,conventional fertilization,balanced fertilization and halved application of potash fertilizer,and studied the effect of different treatments on rice yield and soil nutrient content. The results showed that compared with non-application of potash fertilizer,conventional fertilization and balanced fertilization significantly increased the spike length,thousand kernel weight,yield and total potassium content of the stalk,as well as soil organic matter,total nitrogen and available phosphorus content; compared with conventional fertilization,the balanced fertilization did not significantly increase the rice growth and yield,but effectively increased rice grain total nitrogen,stalk total nitrogen and total phosphorus content,as well as soil available phosphorus and available potassium content. It could be found that potash fertilizer played a certain role in increasing rice yield and soil nutrient content,and the balanced fertilization had the most significant effect.
文摘The increase of the potash fertilizer dose in-duced a raise in efficiency influence of the ni-trogen fertilizer, optimisation of phosphorous fertilizer effect, enhancement of leaf protein production, expansion of assimilating surface and yield growth. In the period of yield forma-tion, the parameters of delayed fluorescence of chlorophyll (DF) of leaf wholly corresponded with key factors that had a dramatic influence on the effectiveness of yield formation. The maximum level of DF amplitude mostly de-pended on the activity of nitrogen metabolism and presumably on active PSII concentration changes per square unit. Half-decay time of this amplitude was predominantly identified by the level of carbohydrate metabolism in the overall plant system, including the quantity of its products and, therefore, mostly by correspon-dence with yield. This is a biological base trig-gering the use of DF parameters for system analyses of plant production process.
文摘Chemical fertilizers,such as potash,have a strong tendency to cake when exposed to humidity.In this work,a novel synchrotron-based X-ray tomography 3D-imaging technique was for the first time employed to investigate the solid bridge formation from 2D and 3D perspectives.Image processing and a theoretical model were presented to demonstrate recrystallization near contact points between potash particles during a conventional drying process.The effect of initial moisture content on the water activity of surface surrounding the contact points was investigated.The results showed that by increasing the moisture content of particles(3%–5%),the dissolution of sylvite increased and the solid bridge length between potash particles was enlarged from 28μm to 44μm due to supersaturation conditions.In addition,the external porosity of potash particles at the end of drying process decreased from 25.3%to 19.5%for 3%and 5%moisture content,respectively.
文摘钾肥对作物生长与土壤供钾水平有重要作用。为了研究新型钾肥对作物生长影响,将新型钾肥材料设计处理Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ6个不同施钾量水平(0、75、150、225、300、375 kg K_(2)O·hm^(-2)),对鲜食玉米的生长、产量以及肥料效果进行系统研究。结果表明:处理Ⅳ(225 kg K_(2)O·hm^(-2))的玉米长势最好;处理Ⅴ(300 kg K_(2)O·hm^(-2))在玉米籽粒、根茎叶等干物质量及钾素吸收量方面均表现最好;处理Ⅳ钾素利用率最高,为58%。在土壤钾素供应方面,土壤当季供钾水平(速效钾)和供钾潜力(缓效钾)均为处理Ⅵ(375 kg K_(2)O·hm^(-2))最高,处理Ⅳ次之。综合来看,处理Ⅳ(225 kg K_(2)O·hm^(-2))对鲜食玉米的整体生长及土壤钾素供应表现最佳。
