EFFECTS OF DIFFERENT WATER CONDITIONS ON RICE GROWTH AT THE SEEDLING STAGE

Authors

  • Jun Zhang Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Universidade de box de Shi, Shihezi, Xinjiang http://orcid.org/0000-0003-4929-6474
  • Yanyan Li Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Universidade de box de Shi, Shihezi, Xinjiang http://orcid.org/0000-0003-4414-2847
  • Haoyu Zahng Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Universidade de box de Shi, Shihezi, Xinjiang http://orcid.org/0000-0001-9052-3806
  • Peng Dong Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Universidade de box de Shi, Shihezi, Xinjiang http://orcid.org/0000-0002-4505-5713
  • Changzhou Wen Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Universidade de box de Shi, Shihezi, Xinjiang http://orcid.org/0000-0003-1677-0678

DOI:

https://doi.org/10.1590/1983-21252019v32n217rc

Keywords:

Aerobic condition. Enzyme activity. Photosynthetic capacity.

Abstract

Water scarcity has led to the adoption of water-saving irrigation technology around the world. Drip-irrigation has been used for rice (Oryza sativa L.) cultivation in Xinjiang, China. Researchers reported 12.0 t/ha yield; however, drip-irrigated rice produces around 6–8 t/ha in practice, and it is clear that water deficiency explains this gap. Therefore, the objective of this experiment was to compare the growth, photosynthetic characteristics, and antioxidant activity of rice grown in nutrient solutions with water potentials of 0.00, -0.02, -0.05, and -0.09 MPa [0, 2.5, 5.0, and 7.5% polyethylene glycol (PEG), respectively], to determine the optimal water conditions for drip-irrigated rice. There was no significant difference between the 0, 2.5, and 5.0% PEG treatments for relative growth rate and relative water content after 10 and 20 days. However, 2.5 and 5.0% PEG treatments substantially affected the photosynthetic capacity and antioxidant enzyme activity after 10 and 20 days. Treatment with 7.5% PEG inhibited shoot growth. There was a significant reduction in antioxidant enzyme activity. Water-saving rice cultivation, such as drip-irrigated rice, suffered mild drought stress at -0.02 to -0.05 Mpa, but this did not inhibit growth. The amount of irrigation should be increased to obtain higher rice yields under drip-irrigation conditions.

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Published

21-05-2019

Issue

Section

Agricultural Engineering