Journal
FIELD CROPS RESEARCH
Volume 219, Issue -, Pages 113-119Publisher
ELSEVIER
DOI: 10.1016/j.fcr.2018.01.031
Keywords
Phosphorus; Yield; Leaf area; Photosynthetic rate
Categories
Funding
- 973 project [2015CB150402]
- National Natural Science Foundation of China [31272252]
- China Agriculture Research System [CARS-02]
- innovative group grant of NSFC [31421092]
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Understanding the responses of the leaf area index (LAI) and photosynthetic rate to phosphorus (P) fertilization is important for optimizing P management and obtaining high grain yield for summer maize. A field experiment with six rates of P application (0, 12.5, 25, 50, 100, 200 kg ha(-1)) was conducted in a maize field in 2014 and 2015. P application significantly increased the soil Olsen-P concentration, and the critical level of soil Olsen-P concentration for maximal shoot P concentration was 20.5 mg kg(-1). As the shoot P concentration increased to 2.01 g kg(-1) in 2014 and 2.40 g kg(-1) in 2015, the LAI and net photosynthetic rate got maximum but then plateaued at higher shoot P concentration. The highest grain yield (11.6 Mg ha(-1)) was attained when the critical LAI and net photosynthetic rate was 4.85 m(2) m(-2) and 28.5 mol CO2 m(-2) s(-1), respectively. The length of barren ear tips was reduced by optimizing the P application rate then increased grain yield. By properly managing P fertilization, maize growers can maximize the LAI and net photosynthetic rate and thereby attain high grain yields without applying excessive P.
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