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91.
Acid, sandy soils selected for blueberry production are usually deficient in plant available phosphorus. Fertilizer addition at planting has not been a recommended practice. This research was designed to evaluate potted blueberry (Vaccinium ashei Reade) plant growth response to P applied at establishment and interacted with N applied during the growing season. Four liter containerized ‘Tifblue’ rabbiteye blueberry plants were transplanted into 4.4 kg of 1:1 v/v loamy sand:peat mixture in an 8‐liter container. Preplant P was incorporated into the mixture at 0, 20, 40, 60, and 80 kg/ha rates. Nitrogen was split‐applied post‐plant four times at 60‐day intervals beginning 30 days after blueberry bushes were transplanted. Total N rates were equivalent to 0, 112, 224, or 336 kg/ha. Plants were harvested 270 days after transplanting. Phosphorus at the 60 and 80 kg/ha rates increased plant growth 40 and 31%, respectively. Plant growth responded linearly to increasing N rate. Leaf and stem weight increases contributed to this linear response while root weight was not affected by fertilizer N. Total plant dry weight was increased by N rates at the 60 and 80 kg/ha P levels. Phosphorus applications increased leaf P levels, but did not increase soil test P. Leaf redness, caused by cool temperatures, was reduced by high N rates. The optimum P rate for fertilization of the soilrpeat mixture in the planting hole under conditions of this experiment was the equivalent of 60 kg/ha. 相似文献
92.
Dr. Leonard Kühn 《Journal of pest science》1950,23(7):108-109
Ohne Zusammenfassung 相似文献
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Leonard Ogierman 《Pest management science》1983,14(4):417-422
Phenmedipham and desmedipham, when injected into a gas chromatograph with N, N, N-trimethylanilinium hydroxide, reacted to give derivatives having good gas chromatographic properties. By this procedure, these two carbamate herbicides yielded N-methylated 3-methoxyphenylcarbamates. Maximum methylation was obtained when the molar ratio of methylating reagent to herbicide was approximately 16: 1. This technique for preparing derivatives provided rapid qualitative and quantitative chromatography of the substances examined, without side-chain decomposition. The derivatives obtained were identified by means of ultraviolet, infrared and mass spectrometric procedures. 相似文献
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The acute toxicity for sheep of 3 alkaloids that occur in Phalaris acquatica was examined by intravenous and oral administration. The lowest tested dose rates that produced clinically observed signs were, for 5-methoxy dimethyltryptamine, 0.1 mg/kg body weight intravenously and 40 mg/kg orally; for gramine, 10 mg/kg intravenously and 500 mg/kg orally; and for hordenine, 20 mg/kg intravenously and 800 mg/kg orally. All induced the clinical signs observed in the nervous form of phalaris toxicity, but none induced the cardiac, sudden death, syndrome. 相似文献
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