›› 2016, Vol. 28 ›› Issue (10): 1755-1763.DOI: 10.3969/j.issn.1004-1524.2016.10.18

• Environmental Science • Previous Articles     Next Articles

Effect of fertilization on photosynthetic characteristics and yield of sunflower on alkaline soil

ZHAO Xiao-xia1, HE Wen-shou1, *, ZHANG Feng-ju2, CAO Zhe1, DANG Ke-ke1, YU Xiao-hong1, CHEN Tian-xiang1   

  1. 1. School of Agriculture, Ningxia University, Yinchuan 750021, China;
    2. Center for Application of New Technology,Ningxia University, Yinchuan 750021, China
  • Received:2016-03-07 Online:2016-10-15 Published:2016-11-20

Abstract: Under alkaline soil conditions, the effects of fertilization on photosynthetic characteristics and yield of oil sunflower were investigated. It was shown that non-rectangular hyperbolic model was appropriate to simulate the net photosynthetic rate with R2>0.99. Photosynthetic rate, stomatal conductance and transpiration rate were enhanced significantly with the increase of photosynthetically active radiation after fertilization, while intercellular CO2 concentration was constantly decreasing. For characteristic parameters of light response curves, the apparent quantum efficiency and maximum net photosynthetic rate reached the highest value under phosphorus-free treatment (NK). Dark respiration rate and light compensation point were the highest under no potassium condition (NP). Light saturation point, yield, biological yield and product increase ratio went maximum under full application of NPK conditions. The highest grain weight was achieved with bio-organic fertilizer application. Unfilled grain rate was the lowest with no potassium applied (NP). In conclusion, proper fertilization could increase grain weight, reduce unfilled grain rate, and increase the accumulation of photosynthetic products and production. Therefore, during the filling stage of oil sunflower, it was feasible to apply phosphorus, potassium and organic fertilizers on the basis of more nitrogen fertilizer rationally to increase the economic output based on the improvement of photosynthetic characteristics.

Key words: alkaline soil, sunflower, photosynthetic characteristics, yield

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