期刊
CROP SCIENCE
卷 57, 期 6, 页码 3156-3169出版社
CROP SCIENCE SOC AMER
DOI: 10.2135/cropsci2016.11.0970
关键词
-
类别
The objective of this study was to quantify the response of maize (Zea mays L.) canopy photosynthesis, development and biomass to P under controlled conditions. Maize was grown in Soil-Plant-Atmosphere Research (SPAR) chambers in Beltsville, MD, with four levels of P (0 [L], 0.01 [Ml], 0.05 [M2], and 0.2 [H] mmol P L-1) and three levels of N (2, 5, and 12 mmol L-1). Five destructive harvests for biomass were taken. There was no significant N effect, so only the P effects were analyzed, and chambers were pooled over P treatments. Maximum net canopy carbon assimilation in the two lowest P rates was 0.4 g C plant(-1) d(-1). Carbon assimilation for the M2 rate was half that of the control (1.3 vs. 2.5 g C plant(-1) d(-1)). End of season biomass was decreased relative to the control by 57% in M2 and 79% in L and M1. Leaf appearance rate and area decreased with increasing P deficiency. Differences in tissue P concentrations varied over a narrow range in the P deficiency treatments, suggesting that continued availability of P to maintain growth was important. Decreases in biomass were due to P-deficiency-related decreases in leaf growth and photosynthetic rate. Light interception in the low P treatments was near 90%, suggesting that decreases in photosynthesis and leaf growth were due to P effects on metabolic factors rather than reduction in light interception.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据