Table 2 Description of treatments.

From: Effects of water saving and nitrogen reduction on the yield, quality, water and nitrogen use efficiency of Isatis indigotica in Hexi Oasis

Irrigation levela

Nitrogen levelb

Treatment abbreviation

High, soil moisture content was 80–90% of the field water-holding capacity (W3)

High, nitrogen application rate: 250 kg/ha (N3)

W3N3(CK)

Medium, nitrogen application rate: 200 kg/ha (N2)

W3N2

Low, nitrogen application rate: 150 kg/ha (N1)

W3N1

Medium, soil moisture content was 70–80% of the field water-holding capacity (W2)

 

W2N3

 

W2N2

 

W2N1

Low, soil moisture content was 60–70% of the field water-holding capacity (W1)

 

W1N3

 

W1N2

 

W1N1

  1. aHigh irrigation level treatment, in which the soil moisture content was 80–90% of the field water-holding capacity. In the medium irrigation level treatment, the soil moisture content was 70–80% of the field water-holding capacity. In the low irrigation level treatment, the soil moisture content was 60–70% of the field water-holding capacity.
  2. bHigh nitrogen level treatment, with a nitrogen application rate of 250 kg/ha. In the medium nitrogen level treatment, the nitrogen application rate was 200 kg/ha. In the low nitrogen level treatment, the nitrogen application rate was 150 kg/ha.
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