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1959-01-01 This book includes factual description of all the main groups of vascular plants. It will dispaly the procedures, general principles, and objectives of comparative morphology. (the branch of biology that deals with the form of living organisms, and with relationships between their structures.)
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The following plant susceptibility list was compiled to guide research workers in planning experiments on specific problems. This list provides a general indication of the response to plants to picloram+.
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1989-07-01 Haloph introduces readers to the hundreds of halophytic species with potential for reclaiming salt-affected lands. It is hoped that the development of these species will be given a high priority.
- Abstract, There are various ways in which plant nutrient supply or concentration affects plant diseases and pests. The supply of nutrients changes the resistance of plants to pathogens and pests by altering growth and tissue composition (e.g., concentration of soluble compounds or defence...
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俗话说“你不知道你有一个问题你就不可能解决问题”，这是诊断植物营养缺乏基础科学的支撑。多年来，很多农民和科学家一起工作，通过多种线索来判断农作物的营养缺乏。这些线索和症状十分有用，特别是在土壤和植物组织试验做不了或行不通时。
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The NPDN was established in 2002 in response to the need to enhance agricultural security through protecting health and productivity of plants in agricultural and natural ecosystems in the U.S. With support from the USDA-NIFA and through the collective efforts of many individuals representing...
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1993-06-15 Amazon.com Description This book discusses the role of essential nutrients in relation to nearly two dozen crops. Use the book's 307 color photographs to diagnose disorders in the field. The accompanying text explains symptoms in detail, with information provided by 31 crop experts. Covers the...
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关键资源2009-01-20 All plants need certain mineral elements for proper growth, development, and maintenance. The basic structure of all organisms is built of carbon (C), oxygen (O) and hydrogen (H). Plants obtain these elements from water (H2O) in the soil and carbon dioxide (CO2) in the air, so no input is...
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Does unsafe food threaten public health in your country? Is the food you eat at risk of contamination? Or, perhaps, has your shipment of agricultural goods been held at the port of entry because of a potential cargo pest infestation? The sanitary and phytosanitary (SPS) plant health distance...
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This 4 part training gives a broad overview and introduction to some basic soil characteristics: phases (solid, liquid, gas), texture, density, structure, reaction (pH), plant-water relationships, organic matter, biology and nutrients. After some classroom discussion we went head out to into the...
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