Plastic film mulching (PM) has a compensatory effect on crop growing degree days by increasing soil temperature. However, only few studies addressed the question whether a terminal time for the compensatory effect window exists and if it exists how it can be quantified. The objective of this study was to use the logistic equation to describe the cumulative crop plant height and to quantify the compensatory effect. Crop apical meristem emergence was used as the reference for the terminal time of the compensatory effect window. A three-year field experiment (2013–2016), conducted under continuous PM in a typical winter wheat (Triticum aestivum L.) and summer maize (Zea mays L.) rotation on the Loess Plateau, Northwest China, indicated that the logistic equation performed well in representing and quantifying the compensatory effect of PM. The compensatory effect of PM reached a plateau during winter wheat growing seasons due to the lack of increased soil temperature during regreening stage, and during summer maize growing seasons due to unfavorably delayed senescence. The terminal time can be estimated during winter wheat and summer maize growing seasons from thermal time nodes at the maximum slope (t2) and second inflection point (t3), respectively. The compensatory coefficients could be estimated by thermal time intervals of (0, t1) and (t1, t2)in winter wheat growing seasons and thermal time internals (0, t1), (t1, t2), and (t2, t3) in summer maize growing seasons, respectively. Compensatory coefficients tended to increase with maize plant development. The minimum data requirement using a logistic equation to calculate compensatory coefficients includes data for staged plant height and mean daily air temperature.
|Journal||Field Crops Research|
|State||Published - Jan 1 2021|
Bibliographical noteFunding Information:
This work is jointly supported by the Project funded by the Open Fund of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau ( A314021402-1908 ), the National Natural Science Foundation of China ( 51709233 , 51879223 , 51879224 ), China Postdoctoral Science Foundation ( 2018M632391 ), the “111” Project ( B12007 ), Natural Science Research Project of Jiangsu Universities ( 17KJD416002 ) and the Open Project Program of Joint International Research Laboratory of Agriculture and Agri-Product Safety , the Ministry of Education of China, Yangzhou University ( JILAR-KF202008 ).
© 2020 Elsevier B.V.
- Apical meristem
- Compensatory coefficient
- Crop model
- Logistic equation
ASJC Scopus subject areas
- Agronomy and Crop Science
- Soil Science