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| 1 | The effect of total carbon on microscopic soil properties and implications for crop production显示文摘Soil structure is a dynamic property affected by physical, chemical, and microbiological processes. Addition of organic matter to soils and the use of different management practices have been reported to impact soil structure and crop production. Moderation in soil temperature and increases in microbial activity and soil water retention are often suggested as reasons for the rise in crop yield when organic matter is added to the soil. Less is known about the direct effect of changes in soil structure on crop production. A field experiment was conducted to study the effect of summer cover crop and in-season management system on soil structure. The experiment was a nested design with summer cover crop as the main plot and management system as the subplot. Summer cover crop treatments included cowpea (Vigna unguiculata L. Walp.) incorporated into the soil in the fall (CI), cowpea used as mulch in the fall (CM), sudangrass (Sorghum vulgare) incorporated into the soil in the fall (S), and dry fallow or bare ground (B). Management systems were organic (ORG) and conventional (CNV) systems. Lettuce (Lactuca sativa L.) and cantaloupes (Cucumis melo L.) were cultivated in rotation in the plots for three consecutive years using the same cover crops and management systems for each plot. Disturbed and undisturbed soil cores were collected at the end of the third year and used for laboratory experiments to measure physical, chemical, and hydraulic properties. Image analysis was used to quantify soil structure properties using a scanning electron microscope on thin sections prepared from the undisturbed soil cores. We found that total soil carbon was correlated with porosity, saturation percentage, and pore roughness. Pore roughness was correlated with crop production in general and with marketable production in particular. We found that the higher the complexity of the pore space, the more water retained in the soil, which may increase soil water residence and reduce plant water stress. | Inma LEBRON Milton Earl MCGIFFEN Jr Donald Louis SUAREZ | 2012 | Journal of Arid Land2012，4，3： | 4 |
| 2 | Single-port laparoscopic surgery:an overview显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
| 3 | Why is Deinococcus radiodurans so resistant to ionizing radiation 显示文摘 | Battista JR Earl AM Park MJ | 1999 | Trends in microbiology1999，7，9： | 1 |
| 4 | Origin of the effect of citrate, tartrate, and acetate on phosphates sorption by soils and synthetic gels 显示文摘 | Earl KD Syers JK Mclaughlin JR | 1997 | Soil Sci1997，43，： | 1 |
| 5 | Single-port laparoscopic surgery : an overview 显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
| 6 | Single-port laparoscopie surgery:an overview显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
| 7 | Zero Defections:Quality Comes to Services显示文摘 | REICHHELD FREDERICK W EARL SASSER JR | 1990 | Harvard Business Review1990，，： | 1 |
| 8 | Why is Deinnococcus radiodurans so resistant to ionizing radiation?显示文摘 | Battista JR Earl AM Park MJ | 1999 | Trends Microbiol1999，7，9： | 1 |
| 9 | Single-port laparoseopie surgery:anover-view显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
| 10 | Single-port laparoseopic surgery: an o- verview显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
| 11 | Single-port laparoscopic surgery:an overview显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
| 12 | Single -port laparoscopic surgery: an overview 显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
| 13 | Laryngeal neurilemmoma:a case report显示文摘 | Newton JR Huckley RW Earl UM | 2006 | Ear Nose Throat J2006，85，7： | 1 |
| 14 | Why Satisfied Customers Defected显示文摘 | Jones Thomas O and Sasser Earl Jr | 1995 | HarvardBusiness Review1995，73，6： | 1 |
| 15 | An effect on the subjective sexual response in premenopausal women with sexual arousal disorder by bremelanotide (PT-141),a melanocortin receptor agonist显示文摘 | Earle DC Heiman JR | 2006 | J Sex Med2006，3，4： | 1 |
| 16 | Single-port laparoscopic surgery:an overview显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
| 17 | The profitable art of service re- covery显示文摘 | Hart C W L James L H Earl W S Jr | 1990 | Harvard Business Review1990，68，： | 1 |
| 18 | Ornithine carbamyltransferase as a liver function test comparative studies in the dog,swine,and man显示文摘 | TEGERIS AS SMALLEY HE Jr EARL FL | 1969 | Toxicol Appl Pharmacol1969，14，1： | 1 |
| 19 | Singleport laparoseopie surgery: an overview 显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endose2009，23，7： | 1 |
| 20 | Single port laparoscopic surgery:an overview显示文摘 | Romanelli JR Earle DB | 2009 | Surg Endosc2009，23，7： | 1 |
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