搜索结果: 1-15 共查到“农学总论 air”相关记录19条 . 查询时间(0.093 秒)
What agricultural 'ecosystems on steroids' are doing to the air（图）
air agricultural 'ecosystems
2014/12/1
ANN ARBOR—In a study that identifies a new, "direct fingerprint" of human activity on Earth, scientists have found that agricultural crops play a big role in seasonal swings of carbon dioxide in the a...
Dehydration kinetics of onion slices in osmotic and air convective drying process
onion drying mathematical models diffusivity osmotic dehydration
2014/9/22
The effect of different pre-treatments (i.e. osmotic dehydration in 10, 15 and 20°Brix NaCl solution and drying air temperature of 50, 60 and 70°C) on drying behaviour of onion slices were investigate...
The effects of different distributor head types, air velocities and fertilizing rates on flow evenness for some fertilizers
Air velocity distributor head fertilizing rate flow evenness fertilizer
2011/1/12
In this study, three different types of distributor head (T, funnel and Y) were tested at three air velocities of 26, 31 and 36 ms-1, and three different fertilizing rates were selected as 12, 16 and ...
The effects of different distributor head types, air velocities and fertilizing rates on flow evenness for some fertilizers
Air velocity distributor head fertilizing rate flow evenness fertilizer
2011/1/12
In this study, three different types of distributor head (T, funnel and Y) were tested at three air velocities of 26, 31 and 36 ms-1, and three different fertilizing rates were selected as 12, 16 and ...
Effect of air assistance on deposition distribution on spraying by tunnel-type electrostatic sprayer
Air assisted sprayers deposit losses spraying tunnel sprayers
2010/9/14
Pesticide drift has always been a serious threat to both living things in the fields and people who are indirectly affected by it. There are many types of pesticide application machines for decreasing...
Studies on Biocontrol of Air-borne Plant Disease by a Filamentous Fungus Producing Antifungal Volatiles
Irpex lacteus phylloplane fungi powdery mildew
2009/6/10
Microorganisms isolated from wheat leaf surfaces were screened for inhibition of wheat powdery mildew.A new screening method, in which wheat leaves were inoculated with Blumeria graminis f. sp.tritici...
Scaling of two-phase capillary pressure-saturation relationships: water-air and oil-air systems
immiscible phases capillary pressure-satura- tion relationship interfacial tension scaling
2008/12/2
Solutions of various problems related to soil contamination by nonaqueous phase liquids (NAPL) require a knowledge of capillary pressure-saturation relationships. In soil-water-air systems, this rela...
Air cleaning in livestock buildings by applying the granular filtration layer
ammonia emission emission reduction granular filter
2008/11/26
The assumptions and results of laboratory research on efficiency of ammonia removal from air by use of the cassette filter in the mechanical ventilation system were presented. A filtration layer consi...
Influence of vehicular traffic on air permeability and groundnut productionin a semi-arid sandy loam soil
semi-arid tillage vehicular traffic compaction
2008/11/18
The effect of vehicular traffic on the production of
groundnut (Arachis hypogea) was investigated in a sandy loam
soil. A randomized complete block design with treatments of 0, 5,
10, 15 and 20 pas...
This paper presents the results of the investigations of water-air relations in peat, sand and their mixture. It was stated that the addition of sand into peat radically changes its water...
Wind-caused air transport through greenhouse screens: a physical modelling approach
air exchange porous screen greenhouse wind pressure physical model
2008/11/10
An understanding of the air exchange through screens is needed to optimise climate control strategies in greenhouses. An analysis of the airflow through porous screens due to wind pressure was perform...
Grain drying method by using changeable air flow
Grain air discharge drying dynamics of moisture absorption
2010/1/15
The article describes a new energy saving method for drying grain. The idea of the method is that once moisture released from grain decreases, air discharge going through the grain is reduced as well....
EFFECT OF AIR TEMPERATURE ON FORECASTING THE START OF CUPRESSACEAE POLLEN TYPE IN PONFERRADA (LEÓN, SPAIN)
forecast dormancy Cupressaceae pollen Ponferrada aerobiology
2010/12/23
In order to survive periods of adverse cold climatic conditions, plant requirements are satisfi ed by means of physiological adaptations to prevent cells from freezing.
MODELLING NET PHOTOSYNTHETIC RATE OF TEMPERATE DRY GRASSLAND SPECIES AND WINTER WHEAT AT ELEVATED AIR CO2 CONCENTRATION
temperate grasses winter wheat photosynthesis modelling
2010/3/24
A number of C3 temperate dry grassland species and winter wheat plants were grown in open
top chambers either at 365 μmol mol-1 (AC) or at 700 μmol mol-1 (EC) air CO2 concentrations. Gas exchange mea...
SPATIAL VARIABILTY OF AMBIENT TEMPERATURE, RELATIVE HUMIDITY AND AIR VELOCITY IN A COLD STORE
ambient temperature relative humidity air velocity spatial distribution
2010/12/2
Spatial distribution the ambient temperature, relative humidity and air velocity were determined for different storage temperatures such as 0 oC, 1 oC, 2 oC and 3 oC in an experimental cold store. Map...