*3.1. Experimental Site*

The experiment was conducted from August to December 2017 in a solar greenhouse located at 34◦20 N, 108◦04 E, at the Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-Arid Areas of the Ministry of Education, Northwest A and F University, Yangling, Shaanxi Province, China. The site is in a semi-arid climate zone with an annual mean sunshine duration of 2163.8 h and frost-free period of 210 days. Lou soil was used in the experimental site. The texture was a silt clay loam (sand 26.0%; silt 33.0%; clay 41.0%). Soil properties of the top 20 cm were: field capacity 23.8% by weight; dry bulk density 1.35 <sup>g</sup>·cm<sup>−</sup>3; organic matter 14.62 <sup>g</sup>·kg−1; total N 1.88 <sup>g</sup>·kg−1; total P 1.37 <sup>g</sup>·kg−1; total K 20.21 <sup>g</sup>·kg−1; and pH 7.82.

Daily maximum and minimum temperatures inside the greenhouse during the experimental period, collected by an Automatic Meteorological Observing Station (Hobo event logger, Onset Computer Corporation, Bourne, MA, USA), are shown in Figure 8. The weather station, which was placed 2 m above the ground, recorded meteorological data at an interval of 15 min [31]. Higher temperatures were observed in August, while lower temperatures were recorded in December (Figure 8).

**Figure 8.** Daily evaporation, maximum and minimum temperature during the growing season at the experimental site.
