Effect of application of K fertilizer and wheat straw to soil on crop yield and status of soil K in the plough layer under different planting systems was studied. The experiments on long-term application of K fertiliz...Effect of application of K fertilizer and wheat straw to soil on crop yield and status of soil K in the plough layer under different planting systems was studied. The experiments on long-term application of K fertilizer and wheat straw to soil in Hebei fluvo aquic soil and Shanxi brown soil in northern China were begun in 1992. The results showed that K fertilizer and straw could improve the yields of wheat and maize with the order of NPK ＋ St 〉 NPK 〉 NP ＋ St 〉 NP, and treatment of K fertilizer made a significant difference to NP, and the efficiency of K fertilizer in maize was higher than in wheat under rotation system of Hebei. In contrast with Shanxi, the wastage of soil potassium was a more serious issue in the rotation system in Hebei, only treatment of NPK ＋ St showed a surplus of potassium and the others showed a wane. K fertilizer and straw could improve the content of water-soluble K, nonspecifically adsorbed K, non-exchangeable K, mineral K, and total K in contrast to NP; however, K fertilizer and straw reduce the proportion of mineral K and improve proportion of other forms of potassium in the two locating sites. Compared with the beginning of orientation, temporal variability character of soil K content and proportion showed a difference between the two soil types; furthermore, there was a decrease in the content of mineral K and total K simultaneously in the two locating sites. As a whole, the effect of K fertilizer applied to soil directly excelled to wheat straw to soil. Wheat straw to soil was an effective measure to complement potassium to increase crop yield and retard the decrease of soil K.展开更多
[Objective] The research aimed to study the coupling model of water and fertilizer for the yield of winter eggplant in greenhouse in Ningxia southern mountain region and provide reference for the criteria and cost-sav...[Objective] The research aimed to study the coupling model of water and fertilizer for the yield of winter eggplant in greenhouse in Ningxia southern mountain region and provide reference for the criteria and cost-saving cultivation of agriculture vegetables in Ningxia southern mountain region.[Method] By using quadratic general rotary unitized design,the mathematics simulation was made on the main cultivation factors(irrigated amount,N application amount,K application amount)that affected the greenhouse eg...展开更多
文摘Effect of application of K fertilizer and wheat straw to soil on crop yield and status of soil K in the plough layer under different planting systems was studied. The experiments on long-term application of K fertilizer and wheat straw to soil in Hebei fluvo aquic soil and Shanxi brown soil in northern China were begun in 1992. The results showed that K fertilizer and straw could improve the yields of wheat and maize with the order of NPK ＋ St 〉 NPK 〉 NP ＋ St 〉 NP, and treatment of K fertilizer made a significant difference to NP, and the efficiency of K fertilizer in maize was higher than in wheat under rotation system of Hebei. In contrast with Shanxi, the wastage of soil potassium was a more serious issue in the rotation system in Hebei, only treatment of NPK ＋ St showed a surplus of potassium and the others showed a wane. K fertilizer and straw could improve the content of water-soluble K, nonspecifically adsorbed K, non-exchangeable K, mineral K, and total K in contrast to NP; however, K fertilizer and straw reduce the proportion of mineral K and improve proportion of other forms of potassium in the two locating sites. Compared with the beginning of orientation, temporal variability character of soil K content and proportion showed a difference between the two soil types; furthermore, there was a decrease in the content of mineral K and total K simultaneously in the two locating sites. As a whole, the effect of K fertilizer applied to soil directly excelled to wheat straw to soil. Wheat straw to soil was an effective measure to complement potassium to increase crop yield and retard the decrease of soil K.
基金Supported by a Grant Program of Ningxia Science and Technology"Water-saving Efficient Technology Development and Demonstration Base Construction of Facility Agriculture in Ningxia Southern Moun-tain Region"Ningxia Natural Foundation"Water-fertilizer Coupling Mechanism of Facility Greenhouse Eggplant to Improve Water and Fertilizer Use Efficiency in Ningxia Southern Mountain Region"(NZ0804)~~
文摘[Objective] The research aimed to study the coupling model of water and fertilizer for the yield of winter eggplant in greenhouse in Ningxia southern mountain region and provide reference for the criteria and cost-saving cultivation of agriculture vegetables in Ningxia southern mountain region.[Method] By using quadratic general rotary unitized design,the mathematics simulation was made on the main cultivation factors(irrigated amount,N application amount,K application amount)that affected the greenhouse eg...
