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氮素是植物生长发育所需的大量元素之一,水稻是我国的主要粮食作物,水稻生产对氮的需求仅次于水,是构成水稻生长成本的主要部分。目前,水稻氮肥表观利用率只有39%,即施氮肥量的50%以上残留在环境中。因此,在保证产量不减的基础上如何提高氮肥的利用效率,减少氮肥的使用量是我国农业可持续发展亟待解决的重要问题。
ANN ARBOR—Biophysics researchers at the University of Michigan have used short pulses of light to peer into the mechanics of photosynthesis and illuminate the role that molecule vibrations play in the...
Water is considered an important factor in the arid and semi-arid areas because water shortage affects the agricultural production. The current study aimed to investigate the influence of water applic...
Water use efficiency in different planting methods of cotton (Gossypium hirsutum L.) was evaluated at three locations in cotton zone of Punjab, Pakistan during the year 2004. Six planting methods vi...
To compare the time courses of dry matter increase and water consumption in the two cultivated rice species, Oryza sativa L. and O. glaberrima Steud., six strains each of O. glaberrima and O. sativa c...
The amount of dry matter produced per photosynthetically active radiation (PAR) intercepted by the canopy (EPAR) and factors which might affect EPAR were determined for various soybean cultivars, and ...
Dry matter production rate in plants is indicated by transpiration rate (Tr) multiplied by water use efficiency (WUE). Our objectives were to establish which of WUE or Tr is dominant in contributing t...
Cultivar differences of effeciency of solar energy utilization (Eu) and efficiency of solar energy utilization in grain (Eu grain) in two-rowed barley (34 cultivars) were investigated from 1987 to 198...
Intergeneric crosses between Japanese wheat cultivars (Triticum aestivum L. cv. Nishikazekomugi and Zenkojikomugi) and a tetraploid wild barley, Hordeum bulbosum L. were used to examine the effect of ...
To examine the possibility of breeding high-yielding cultivars with high nitrogen use efficiency for dry matter accumulation (NUEd) and to provide simple criteria for the selecting and breeding high-y...
The aim of this study is to estimate the effects of leaf rolling on the transpiration, photosynthesis, dry matter production and water use efficiency(WUE), of four rice cultivars that differ in the de...
The dry matter production, dark respiration rate and growth efficiency of high-yielding rice cultivar 'Takanari', grown under two levels of nitrogen fertilization (11, 17 gN / m2), were compared with ...
This study was investigated to clarify the efficiency of bumble bees (Bombus (Bombus) terrestris) as pollinators, and the cultivar selection of blueberries for forcing culture. The flowering and harve...
This paper estimates a stochastic production frontier based on experimental data of cereals production in Finland over the period 1977-1994. The estimates of the production frontier are used to analyz...

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