Relationship between P and N concentrations in timothy
Relationship between P and N concentrations in timothy
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DOI：
10.4141/p97-125
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发表时间：
1999
影响因子：
1.2
通讯作者：
G. Bélanger;J. E. Richards
中科院分区：
文献类型：
--
作者：
G. Bélanger;J. E. Richards
量化植物中N和P状况的工具可能有助于实现这些营养素的有效管理，并优化作物生长和产量。本研究的目的是建立磷和氮浓度的关系，在梯牧草（Pheluspratense L.）特别是估算诊断缺磷症所需的临界磷浓度。在1991年和1992年春季，在非限制性氮素条件下，用早熟和晚熟品种进行了两个实验，并在1993年春季和1994年夏季进行了两个实验，四个氮素施肥率生长梯牧草P和N浓度之间的关系进行了测定。拍摄生物量和P和N浓度测定每周在每个再生周期。在所有四个实验中，P和N浓度随时间的推移而下降。随着地上部生物量的增加，P浓度的降低与N浓度的降低大致相似。我们之间的关系…
Tools quantifying the status of N and P in plants may help to achieve efficient management of these nutrients and to optimize crop growth and yield. The objective of this study was to establish the relationship between P and N concentrations during the regrowth of timothy (Phleum pratense L.) and, in particular, to estimate the critical P concentration required to diagnose P deficiency. The relationship between P and N concentrations was determined for timothy grown in two experiments conducted with early- and late-maturing cultivars under non-limiting N conditions in spring of 1991 and 1992, and in two experiments with four rates of N fertilization conducted in the spring of 1993 and the summer of 1994. Shoot biomass and P and N concentrations were determined weekly during each regrowth cycle. The P and N concentrations decreased with time in all four experiments. The decrease in P concentration with increasing shoot biomass was generally similar to the decrease in N concentration. The relationship betwe...