Scope of study. Nitrogen mineralization of soil organic matter has long been recognized to be very important in meeting plant N needs. Recommendations for N fertilizer requirements for cereals are presently based on the level of nitrate in the top 15 cm of the soil before planti…
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Chemotaxis is probably a short-range mechanism because of peristaltic movements of the oviduct, which may prevent the formation of a long-range chemoattractant gradient. Following the observations that, at ovulation, a temperature difference of 1-2°C is established within the ov…