Crop growth rate

Crop growth rate (CGR) (Weight2- weight,)/(time2- time,) Varies3 ... 

Crop yield and crop quality are often determined by the same regulatory mechanisms that control crop growth rate and vegetative plant development (17,20,21). In PBR-treated tomato plants as shown in Table 1, harvestable crop yield is increased as much as 2.25 times that of the control (0.8 kg plant-1). 

The Renewables-Intensive Global Energy Scenario (RIGES) predicts a primary energy potential from biomass resources for Western Europe to be 14160 PJ/year by 2025 and 14 170 PJ/year by 2050 (Johansson et al., 1993). Thereby the biomass potential comprises resources from wood, energy crops, agricultural residues and industrial biomass residues. The estimates are based on the biomass production at that time in combination with assumptions of future growth rates. 

Effect of Thallium on Plants and Animals. On January 29, 1863, R. C. Bottger announced that he had detected spectroscopic traces of thallium in wine, chicory, tobacco, sugar beet, and beech wood, and had concluded that it must be widely diffused in the vegetable kingdom (47, 73). Because of the toxicity of thallium compounds, they are sometimes added in small concentrations to the soil of rodent-infested fields. Too high a concentration of thallium inhibits germination, growth rate, and chlorophyll formation in the crops, especially in rainy weather (78). 

We have been studying the anaerobic response in cotton, a crop which experiences a reduction in growth rate during irrigation or waterlogging. Cotton shows a level of anaerobically inducible ADH activity comparable with that of maize, a plant which is relatively resistant to anoxia (A. Millar, unpublished data T.L. Setter, unpublished data). However, in cotton the level of the enzyme catalysing the preceding step in the fermentation pathway, PDC, is relatively low and this may lead to low rates of ethanol synthesis and hence low tolerance to anoxia. 

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