Dry Matter Accumulation in Maize in Response to Film Mulching and Plant Density in Northeast China

Zhenchuang Zhu; Shmulik P Friedman; Zhijun Chen; Junlin Zheng; Shijun Sun

doi:10.3390/plants11111411

Dry Matter Accumulation in Maize in Response to Film Mulching and Plant Density in Northeast China

Plants (Basel). 2022 May 26;11(11):1411. doi: 10.3390/plants11111411.

Authors

Zhenchuang Zhu¹, Shmulik P Friedman², Zhijun Chen¹, Junlin Zheng¹, Shijun Sun¹

Affiliations

¹ College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China.
² Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel.

Abstract

Film mulching in combination with high plant density (PD) is a common agronomic technique in rainfed maize (Zea mays L.) production. However, the effects of combining colored plastic film mulching and PD on dry matter accumulation (DMA) dynamics and yield of spring maize have not been thoroughly elucidated to date. Thus, a 2-year field experiment was conducted with three mulching treatments (no mulching (M0), transparent plastic film mulching (M1), and black plastic film mulching (M2)) and five plant densities (60,000 (D1), 67,500 (D2), 75,000 (D3), 82,500 (D4), and 90,000 plants ha^-1 (D5)). A logistic equation was used to simulate the DMA process of spring maize by taking the effective accumulated air temperature compensated by effective accumulated soil temperature as the independent variable. The results showed that compared with M0 treatment, the growth period of M1 and M2 treatments was preceded by 10 and 4 days in 2016, and 10 and 7 days in 2017, respectively. The corrected logistic equation performed well in the characterization of maize DMA process with its characteristic parameter (final DMA, a; maximum growth rate of DMA, GR_max; effective accumulated temperature under maximum growth rate of DMA, x_inf; effective accumulated temperature when maize stops growing, x_max; effective accumulated temperature when maize enters the fast-growing period, x₁). Plastic film color mainly affected DMA by influencing x_inf. PD mainly affected DMA by affecting GR_max and x₁. During the first slow growing period, the DMA of M1 treatment was the largest among the three mulching treatments, however, during the fast growing period, the DMA of M2 treatment accelerated and exceeded that of M1 treatment, resulting in the largest final DMA(a) and yield. When the PD was increased from D1 to D4, the maximum growth rate (GR_max) continued to increase, and the effective accumulated temperature when maize enters the fast growing period (x₁) continued to decrease, which substantially increased the final DMA(a) and yield. The application of M2D4 treatment can harmonize the relevant factors to improve the DMA and yield of spring maize in rainfed regions of Northeast China.

Keywords: effective accumulated temperature; logistic equation; maize developmental progress; plastic film color; temperature compensation.

Abstract

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