Analysis of Leaf Area Index Dynamic and Grain Yield Components of Intercropped Wheat and Maize under Straw Mulch Combined with Reduced Tillage in Arid Environments

Fuxue Feng,Falong Hu,Aizhong Yu,Yao Guo,Cai Zhao,Wen Yin,Qiang Chai

doi:10.5539/jas.v8n4p26

Abstract

<p class="2">Knowledge on effect of yield formation under straw combined with plastic film mulch is important in highlighting the importance of cultivating high-efficient and high-yield crops in the arid environments. In this study, we developed a ‘double-mulching’ system, i.e., plastic film coupled with straw mulch, integrated together with intensified strip intercropping. We determined (i) the responses of leaf area index improvement to the integrated double mulching system, and (ii) Its effects on yield formation process and mechanism of intercropped wheat and maize under the integrated systems. Experiments were carried out in northwest China in 2009 to 2011. Results showed that wheat-maize strip intercropping in combination with plastic film and straw covering on the soil surface (i.e., NTS) increased maize yield by 27 to 42% compared to conventional monoculture maize, and increased wheat yield by 149 to 160% compared to conventional monoculture wheat. The crops on NTS had higher harvest index of maize, an increase of 8.2 to 21.6% than that of conventional monoculture maize. NTS system increased spike number (i.e., SN) by an average of 30.4%, increased kernel number per spike (i.e., KNS) by an average of 10.8%, and increased thousand-kernel weight (i.e., TKW) by an average of 7.0% of intercropped wheat in comparison with conventional monoculture wheat. Similarly, there was an average increase of 5.7% of SN, 23.8% of KNS, and 7.5% of TKW under intercropped maize in comparison with conventional monoculture maize. Moreover, the treatment on NTS had greater leaf area index (i.e., LAI) an average increase of 64.1% than that in conventional monoculture maize. Similarly, LAI had an average increase of 29.3% than conventional monoculture wheat. Path analysis exhibited that straw mulching combined with reduced tillage increased the grain yield of intercropped wheat by improving KNS, and increased the grain yield of intercropped maize by improving SN. We conclude that the intercropping system in combination with plastic film and straw mulching can be an effective system for boosting crop productivity via improving yield components and LAI under limited resources in arid enviroments.</p>

Highlights

Wheat (Triticum aestivum L.) and maize (Zea mays L.) are two main grain crops in China
Results showed that wheat-maize strip intercropping in combination with plastic film and straw covering on the soil surface (i.e., NTS) increased maize yield by 27 to 42% compared to conventional monoculture maize, and increased wheat yield by 149 to 160% compared to conventional monoculture wheat
Compared to monoculture maize without straw retention, i.e., the control treatment (CTM), wheat and maize intercropping increased yield by 16 to 42%, where as increase in yield was 118 to 160% compared to conventional monoculture wheat

Summary

Introduction

Wheat (Triticum aestivum L.) and maize (Zea mays L.) are two main grain crops in China. Understanding how to produce more food while utilizing the limited arable land resources, it is urgent to meet people’s demand. Intercropping, an agricultural cropping pattern has been long practiced in many parts of the world (Francis, 1986). It is characterized by making full use of water and nutrient resources to meet the actual needs, achieving agricultural biodiversity, and increasing yield significantly (Li et al, 2001b; Yin et al, 2015). It can be said that intercropping has played a very significant role in ensuring secure food supply and increasing farmers’ income in China and balancing high grain demands and low water availability (Fan et al, 2013; Hu et al, 2015)

Methods

Results

Conclusion