Chin Bull Bot ›› 2015, Vol. 50 ›› Issue (1): 47-54.doi: 10.3724/SP.J.1259.2015.00047

• EXPERIMENTAL COMMUNICATIONS • Previous Articles     Next Articles

Effect of Combined Application of Nitrogen and Phosphorus on Photosynthesis Parameters at Grain-filling Stage and Grain Yield in Winter Wheat

Caixia Huang1, 2, Shouxi Chai1, *, Deming Zhao3, Lei Chang1, Hongbo Cheng4, Changgang Yang1   

  1. 1Agronomy College, Gansu Agricultural University, Lanzhou 730070, China
    2College of Engineering, Gansu Agricultural University, Lanzhou 730070, China
    3Gansu Government Project Approval Center, Lanzhou 730030, China
    4College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou 730030, China
  • Received:2014-01-21 Accepted:2014-03-21 Online:2015-04-09 Published:2015-01-01
  • Contact: Chai Shouxi E-mail:sxchai@126.com
  • About author:

    ? These authors contributed equally to this paper

Abstract:

The effect of nitrogen and phosphorus fertilizer on photosynthetic characteristics and grain yield of winter wheat were investigated in the Northwest Oasis area of China. Four treatments were 2 for nitrogen (165 and 225 kg·hm-2) and 2 for phosphorus (105 and 165 kg·hm-2). With low N application (N1P1, N1P2), the diurnal variations of net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) were presented as double-peak curves, with obvious midday decrease in photosynthesis. With high N (N2P1, N2P2), the midday decrease in photosynthesis weakened or even disappeared. Fertilizer P had less effect on the photosynthesis as compared with N. Among the fertilization treatments, treatment N2P2 conferred the highest leaf area index, canopy apparent photosynthetic rate (CAP), grain number, spike number, 1 000 grain weight and grain yield as compared with N1P1 and N1P2, but not N2P1. Water-use efficiency was lower with N2P2 than N2P1 and significantly higher for both N1P1 and N1P2, with no difference between N1P1 and N1P2. Fertilizer N had greater effect on the midday decrease in photosynthesis than P, but the combined application of N and P had no significant co-effect. A combined application of 225 (N) and 105 kg·hm-2 (P) enhanced Pn and grain yield.

Figure 1

Effects of fertilizers treatments on leaf area index of winter wheat LAI: Leaf area index"

Figure 2

Diurnal variations of environmental factors at grain-filling stage of winter wheat (means±SD) Ca: Carbon dioxide concentration; PAR: Photosynthetic available radiation; Ta: Air temperature; RH: Air relative humidity"

Figure 3

Effects of fertilizers treatments on diurnal variation of net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), intercellular CO2 concentration (Ci), stomata limitation (Ls) and the canopy apparent photosynthetic rate (CAP) at filling stage of winter wheat (A) Net photosynthetic rate; (B) Stomatal conductance; (C) Transpiration rate; (D) Intercellular CO2 concentration; (E) Stomatal limitation value; (F) Canopy apparent photosynthetic rate"

Table 1

Effects of combined nitrogen and phosphorus fertilizers on yield and its components of winter wheat"

Treatments Spike number
(spike×104·hm-2)
Grain number
(No·spike-1)
1 000 grain
weight (g)
Grain yield
(kg·hm-2)
WUE
(kg·hm-2·mm-1)
N1P1 879.77 aA 20.27 bB 50.63 cB 6 753.38 cC 11.09 bB
N1P2 903.79 aA 21.43 abAB 51.41 bcB 7 098.79 bB 11.14 bB
N2P1 882.11 aA 21.95 aAB 52.55 abAB 7 644.73 aA 11.67 aA
N2P2 897.12 aA 22.73 aA 53.55 aA 7 686.25 aA 11.49 aAB
FN 3.36 9.52* 23.97** 199.13** 19.78**
FP 0.63 4.07 4.65 9.53* 0.37
FN×P 3.02 0.16 0.07 5.57* 1.164 0
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