Abstract

To optimize cultivation and management of the biannual planting for winter wheat and summer maize in eastern Shandong, effects of different amount of water-retention and slow-release fertilizers on net photosynthetic rate and SPAD value of winter wheat and summer maize was studied in the field. The experimental materials were Jimai22 as winter wheat varieties and Heima 603 as maize varieties. The results showed that, in the case of same costs, considering the net photosynthetic rate and SPAD value of wheat and maize under different treatments, the treatment of single application of water-retention and slow-release fertilizers was superior than that of single application of compound fertilizer and the indicators of treatments applying both two fertilizers were higher than that of single application of either fertilizer and within a certain range, with the increasing ratio of the amount of the water-retention and slow-release fertilizers, the SPAD value maintained higher and the net photosynthetic rate was correspondingly faster.

Keywords:

Net photosynthetic rate, SPAD value, water-retention and slow-release fertilizers,

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Competing interests

The authors have no competing interests.

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