[Objective] The experiment aimed to explore the influence of enhanced ultraviolet radiation-B on maize in arid regions of middle-high elevation for correct assessing the influence of enhanced ultraviolet radiation-B o...[Objective] The experiment aimed to explore the influence of enhanced ultraviolet radiation-B on maize in arid regions of middle-high elevation for correct assessing the influence of enhanced ultraviolet radiation-B on maize and providing scientific reference to make proper countermeasures. [ Method] The location test in field and lift lamp of UV-B were used to observe the changes of maize height, leaf area and number of green leaves under influences of different UV-B radiation. [ Result] In arid regions of middle-high elevation, enhanced ultraviolet radiation-B could dwarf maize plant, decrease leaf area, decline number of green leaves and yield. The reason of decreasing leaf area was that enhanced ultraviolet radiation-B shortened leaf length and leaf width while the reason of declining yield was that yield components were all negatively influ- enced and with the increase of ultraviolet radiation-B, the yield declined dramatically. [ Concluslonl The result of this experiment would be good for maize production in arid regions of middle-high elevation.展开更多
A field test was conducted to investigate the effects of different row spac- ing and planting density on grain filling rate, yield and other agronomic characters of a maize variety Xianyu 335, thereby determining the ...A field test was conducted to investigate the effects of different row spac- ing and planting density on grain filling rate, yield and other agronomic characters of a maize variety Xianyu 335, thereby determining the optimum planting density for maize in the Huang-Huai-Hai region. The results showed that the grain filling rate of Xianyu 335 was tended to decrease with the increase of planting density, and un- der the same planting density, the grain fill row spacing. Under the planting density of spacing showed little effect on the kernels ng rate decreased with the increased 60 000 plants/hm2, changing the row per spike of Xianyu 335; under the planting density of 75 000 plants/hm2, with the increase of row spacing, the kernels per spike of Xianyu 335 decreased; and under the condition of same row spacing, the yield of Xianyu 335 under the planting density of 75 000 plants/hm2 was higher than that under the planting density of 60 000 plants/hm2. The yield of Xianyu 335 reached the highest level at the row spacing of 50 cm and （40 ＋ 80） cm.展开更多
基金Supported by Natural Science Foundation of Ningxia Autonomous Re-gion(A1012)~~
文摘[Objective] The experiment aimed to explore the influence of enhanced ultraviolet radiation-B on maize in arid regions of middle-high elevation for correct assessing the influence of enhanced ultraviolet radiation-B on maize and providing scientific reference to make proper countermeasures. [ Method] The location test in field and lift lamp of UV-B were used to observe the changes of maize height, leaf area and number of green leaves under influences of different UV-B radiation. [ Result] In arid regions of middle-high elevation, enhanced ultraviolet radiation-B could dwarf maize plant, decrease leaf area, decline number of green leaves and yield. The reason of decreasing leaf area was that enhanced ultraviolet radiation-B shortened leaf length and leaf width while the reason of declining yield was that yield components were all negatively influ- enced and with the increase of ultraviolet radiation-B, the yield declined dramatically. [ Concluslonl The result of this experiment would be good for maize production in arid regions of middle-high elevation.
基金Supported by Earmarked Fund for China Agriculture Research System(NYCYTX-02)~~
文摘A field test was conducted to investigate the effects of different row spac- ing and planting density on grain filling rate, yield and other agronomic characters of a maize variety Xianyu 335, thereby determining the optimum planting density for maize in the Huang-Huai-Hai region. The results showed that the grain filling rate of Xianyu 335 was tended to decrease with the increase of planting density, and un- der the same planting density, the grain fill row spacing. Under the planting density of spacing showed little effect on the kernels ng rate decreased with the increased 60 000 plants/hm2, changing the row per spike of Xianyu 335; under the planting density of 75 000 plants/hm2, with the increase of row spacing, the kernels per spike of Xianyu 335 decreased; and under the condition of same row spacing, the yield of Xianyu 335 under the planting density of 75 000 plants/hm2 was higher than that under the planting density of 60 000 plants/hm2. The yield of Xianyu 335 reached the highest level at the row spacing of 50 cm and （40 ＋ 80） cm.
