Photosynthesis and winter wheat yield responses to supplemental irrigation based on measurement of water content in various soil layers

Supplemental irrigation affected flag leaves senescence post-anthesis and grain yield of winter wheat in the Huang-Huai-Hai Plain of China

“…The detailed method of analysis on grain filling rate was described in Guo et al (2014a). Grain yield (t ha −1 ) was determined from the 3 m 2 quadrat cuts from each plot and was reported at a 12% moisture content basis.…”

“…But in this area, the flood and border irrigation practices were generally applied four or five times (about 150 mm water at one time) during the winter wheat growing season, which results in wasting water resource. Furthermore, evapotranspiration is approximately 400 mm to 500 mm during the winter wheat growing season, whereas precipitation is approximately 100 mm to 180 mm, these values are approximately 25% to 40% of the crop water requirement throughout the winter wheat growing season (Guo et al, 2014a). During the grain filling stage, in particular, water shortage accelerates leaves senescence and reduces grain yield (Sawhney and Singh, 2002).…”

Water use and soil nitrate nitrogen changes under supplemental irrigation with nitrogen application rate in wheat field

“…In the semiarid Loess Plateau in China, Guo et al (2012) reported that the optimal N fertilisation rates in dry, normal and wet years were 45, 135 and 180 kg ha −1 , respectively, in a rain-fed winter wheat cropping system. Di Paolo and Rinaldi (2008) indicated that an appropriate soil water level had a positive effect on N availability and the simultaneous uptake of water and N. Guo et al (2014) and Li et al (2012) noted that supplemental irrigation significantly affected soil moisture content. Therefore, it is necessary to study the effect of the optimal N fertilisation rate under supplemental irrigation on water use and wheat yield in this area.…”

Identification of plant hormones and candidate hub genes regulating flag leaf senescence in wheat response to water deficit stress at the grain‐filling stage

“…The 0‐ to 30‐cm soil layer was divided into three layers (0–10 cm, 10–20 cm, and 20–30 cm) with three repetitions per plot. Soil water content (SWC), volumetric water content (VWC), soil relative water content (SRWC), and the bulk density ( γ bd ) were calculated using the following equations (Guo, Yu, Wang, Shi, & Zhang, ): where FW (g) is the soil sample fresh weight, DW (g) is the soil sample dry weight, FC (%) is the field capacity, SSW (g) is the saturated soil weight when the soil moisture reached 100% FC, and V (cm 3 ) is the volume of soil in rings (200 cm 3 in the present paper).…”