漂浮
发表于 2025-3-25 03:31:48
Some important properties of pesticide deposits on various surfaces,in problems in insect control with the materials then available became acute. Scale insects on citrus had developed resistance to hydrogen cyanide in various areas and oil sprays were employed in its place. But the margin was narrow between the amount needed for insect control and that which injured
瘙痒
发表于 2025-3-25 10:16:03
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tenuous
发表于 2025-3-25 13:45:55
The chemical and physical nature of plant surfaces in relation to the use of pesticides and to theieneficial side are the great many instances of increased production that have resulted. On the other side are the many misuses that have resulted in injuries and death, and the wide array of residue problems of varying degrees of seriousness. The nature of plant surfaces is important from both aspec
艰苦地移动
发表于 2025-3-25 16:41:52
Principles for the establishment of pesticide residue tolerances,ed for appropriate action. The concept of establishing safe limits for chemicals, both those produced by man and those of natural origin is not new or novel. In recent years the increase in the amount and number of pesticide chemicals introduced into the environment of man and his animals for use in
NEG
发表于 2025-3-25 21:19:34
Pesticide residue analysis by oxygen flask combustion,by shaking an alkaline solution contained in the flask and analysis of the resulting solution followed. This procedure has been modified by . (1960) and . and . (1961) for direct combustion of evaporated crop extracts containing chlorinated pesticides.
浪荡子
发表于 2025-3-26 03:01:37
Some important properties of pesticide deposits on various surfaces, the trees. Hence much attention was paid to formulations and dosages and deposits upon various parts of a sprayed tree. To a somewhat lesser degree, the same situation had come about in the use of lime-sulfur solution for control of other scale insects on deciduous trees.
analogous
发表于 2025-3-26 05:49:22
Insecticide residues in olive oils and table olives from efforts to control the olive fly,ese nations throughout the world, and for some of them it constitutes one of the most important economic resources. As an illustration, it will suffice to say that Italy alone has 165 million olive trees capable of producing each year about 350,000 tons of oil, worth around 155 billion Lire or 250 million dollars (Min. Agr. Foreste-Italy, 1960).
Indebted
发表于 2025-3-26 09:50:31
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多节
发表于 2025-3-26 13:16:52
Pesticide residue analysis by microcoulometric gas chromatography,ccuracy and sensitivity is obtained with this instrument with little or no cleanup of sample extracts. Residues of 0.05 to 100 p.p.m. are easily found by varying the size of sample but the MCGC is not limited to this range.
graphy
发表于 2025-3-26 19:30:03
ion and manufacture, yet without surveillance and intelligent control some of those that persist could at times conceivably endanger the public health. The object of "Residue Reviews" is to provide concise, critical reviews of timely advances, philosophy, and significant areas of accomplished or nee