Intercropping combined with nitrogen input promotes proso millet (Panicum miliaceum L.) growth and resource use efficiency to increase grain yield on the Loess plateau of China

Abstract Field experiment was performed on the Loess Plateau of China in 2018 and 2019 to investigate the effects of intercropping with nitrogen (N) management on proso millet growth and resource utilization. A split-plot experimental design for the planting pattern (sole proso millet (SP) and proso millet/mung bean intercropping (PM)) and N fertilizer application rate (N0, 0 kg N ha−1; N60, 60 kg N ha−1; N120, 120 kg N ha−1; and N180, 180 kg N ha−1 for proso millet) was used. Results showed that intercropping combined with N fertilization enhanced the leaf photosynthetic efficiency of proso millet by facilitating stomatal opening, and such improvements were conducive to increasing the maximal quantum yield of PSII photochemistry and the photochemical quenching coefficient. Specifically, intercropping combined with the N120 treatment was an efficient farming practice that increased radiation use efficiency by 18.1 % and 17.9 %, water use efficiency by 60.2 % and 61.8 %, and N uptake by 96.0 % and 71.6 % in 2018 and 2019, respectively, compared with those parameters in the N0 treatment in the sole planting system. Similar improvements were observed for grain yield, which reached maximum values at N120 (6331.8 kg ha−1 and 6531.3 kg ha−1 in 2018 and 2019, respectively) in the PM treatment. These responses resulted in an increased harvest index and land equivalent ratio. Consequently, intercropping combined with moderate N inputs reduces the chemical fertilizer application rate and increases crop productivity and is considered to be a reasonable strategy for field management.

[1]  Cai Zhao,et al.  Straw retention and plastic mulching enhance water use via synergistic regulation of water competition and compensation in wheat-maize intercropping systems , 2018, Field Crops Research.

[2]  R. W. Willey.  Resource use in intercropping systems , 1990 .

[3]  Jianliang Huang,et al.  Producing more grain with lower environmental costs , 2014, Nature.

[4]  Pute Wu,et al.  Border row effects on light interception in wheat/maize strip intercropping systems , 2017 .

[5]  P. Vitousek,et al.  Significant Acidification in Major Chinese Croplands , 2010, Science.

[6]  C. Dordas,et al.  Competition indices of common vetch and cereal intercrops in two seeding ratio , 2007 .

[7]  B. Feng,et al.  Boosting proso millet yield by altering canopy light distribution in proso millet/mung bean intercropping systems , 2020 .

[8]  Xudong Zhang,et al.  Ridge-furrow mulching system drives the efficient utilization of key production resources and the improvement of maize productivity in the Loess Plateau of China , 2019, Soil and Tillage Research.

[9]  Li Xiangdong,et al.  Timing and splitting of nitrogen fertilizer supply to increase crop yield and efficiency of nitrogen utilization in a wheat–peanut relay intercropping system in China , 2019, The Crop Journal.

[10]  D. Herridge,et al.  Global inputs of biological nitrogen fixation in agricultural systems , 2008, Plant and Soil.

[11]  J. R. Evans.  Photosynthesis and nitrogen relationships in leaves of C3 plants , 2004, Oecologia.

[12]  F. Mondani,et al.  Analyzing the energy balances of double-cropped cereals in an arid region , 2015 .

[13]  F. Celette,et al.  Intercropping with legume for agroecological cropping systems: Complementarity and facilitation processes and the importance of soil microorganisms. A review , 2017 .

[14]  Jiang Liu,et al.  Relay-intercropping soybean with maize maintains soil fertility and increases nitrogen recovery efficiency by reducing nitrogen input , 2020 .

[15]  Tie Cai,et al.  Ridge and furrow planting pattern optimizes canopy structure of summer maize and obtains higher grain yield , 2018 .

[16]  Yushan Wu,et al.  Changes in light environment, morphology, growth and yield of soybean in maize-soybean intercropping systems , 2017 .

[17]  Jeffrey A. Coulter,et al.  Expanding row ratio with lowered nitrogen fertilization improves system productivity of maize/pea strip intercropping , 2020 .

[18]  B. Feng,et al.  Interspecific root interactions and water-use efficiency of intercropped proso millet and mung bean , 2020 .

[19]  Fei Wang,et al.  SOIL EROSION, CONSERVATION, AND ECO‐ENVIRONMENT CHANGES IN THE LOESS PLATEAU OF CHINA , 2013 .

[20]  B. Feng,et al.  Nitrogen deficiency induced a decrease in grain yield related to photosynthetic characteristics, carbon–nitrogen balance and nitrogen use efficiency in proso millet (Panicum miliaceum L.) , 2020, Archives of Agronomy and Soil Science.

[21]  H. Lambers,et al.  Intercropping alleviates the inhibitory effect of N fertilization on nodulation and symbiotic N2 fixation of faba bean , 2009, Plant and Soil.

[22]  Jiang Liu,et al.  Yield advantage and nitrogen fate in an additive maize-soybean relay intercropping system. , 2019, The Science of the total environment.

[23]  Jiang Liu,et al.  PAR Interception and Utilization in Different Maize and Soybean Intercropping Patterns , 2017, PloS one.

[24]  Fusuo Zhang,et al.  Wheat/maize or wheat/soybean strip intercropping - I. Yield advantage and interspecific interactions on nutrients , 2001 .

[25]  Dongmei Li,et al.  Effects of nitrate deficiency on nitrate assimilation and chlorophyll synthesis of detached apple leaves. , 2019, Plant physiology and biochemistry : PPB.

[26]  V. Sadras,et al.  Nitrogen supply and sink demand modulate the patterns of leaf senescence in maize , 2018, Field Crops Research.

[27]  Cai Zhao,et al.  Improving N management through intercropping alleviates the inhibitory effect of mineral N on nodulation in pea , 2017, Plant and Soil.

[28]  Xiao-yan Li,et al.  Ridge-furrow plastic-mulching with balanced fertilization in rainfed maize (Zea mays L.): An adaptive management in east African Plateau , 2017 .

[29]  F. Gérard,et al.  The intercropping cowpea-maize improves soil phosphorus availability and maize yields in an alkaline soil , 2014, Plant and Soil.

[30]  Cai Zhao,et al.  Boosting system productivity through the improved coordination of interspecific competition in maize/pea strip intercropping , 2016 .

[31]  A. Raftery,et al.  World population stabilization unlikely this century , 2014, Science.

[32]  Xinchun Cao,et al.  Radiation interception and utilization by wheat/maize strip intercropping systems , 2015 .

[33]  B. Feng,et al.  Effect of intercropping on leaf senescence related to physiological metabolism in proso millet (Panicum miliaceum L.) , 2019, Photosynthetica.

[34]  P. Westra,et al.  A Plant Process Economic Model for Weed Management Decisions in Irrigated Onion , 1999 .

[35]  Yanjun Zhang,et al.  Wide-strip intercropping of cotton and peanut combined with strip rotation increases crop productivity and economic returns , 2019, Field Crops Research.

[36]  C. Beierkuhnlein,et al.  Homogenizing and diversifying effects of intensive agricultural land-use on plant species beta diversity in Central Europe - A call to adapt our conservation measures. , 2017, The Science of the total environment.

[37]  K. Dong,et al.  Effects of nitrogen management and intercropping on faba bean chocolate spot disease development , 2020 .

[38]  A. Paquette,et al.  The new Green Revolution: Sustainable intensification of agriculture by intercropping. , 2018, The Science of the total environment.

[39]  Pute Wu,et al.  Maize–Soybean Intercropping Interactions Above and Below Ground , 2014 .

[40]  H. Feizi,et al.  Determination of optimal strip width in strip intercropping of maize (Zea mays L.) and bean (Phaseolus vulgaris L.) in Northeast Iran , 2015 .

[41]  Ying Zhang,et al.  New technologies reduce greenhouse gas emissions from nitrogenous fertilizer in China , 2013, Proceedings of the National Academy of Sciences.

[42]  R. Tournebize,et al.  Modeling soil–root water transport and competition for single and mixed crops , 1999, Plant and Soil.

[43]  Q. Chai,et al.  Quantification of Soil Water Competition and Compensation Using Soil Water Differences between Strips of Intercropping , 2014, Agricultural Research.

[44]  J. Paruelo,et al.  Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence. , 2016, Journal of plant physiology.

[45]  Wenyu Yang,et al.  Effect of aboveground and belowground interactions on the intercrop yields in maize-soybean relay intercropping systems , 2017 .

[46]  A. Domenach,et al.  Yield performance and seed production pattern of field-grown pea and soybean in relation to N nutrition , 1994 .

[47]  M. Awal,et al.  Radiation interception and use by maize/peanut intercrop canopy , 2006 .

[48]  Qi Wu,et al.  Effects of alfalfa intercropping on crop yield, water use efficiency, and overall economic benefit in the Corn Belt of Northeast China , 2018 .

[49]  Water use and crop coefficient of the wheat–maize strip intercropping system for an arid region in northwestern China , 2015 .

[50]  Cai Zhao,et al.  Straw retention combined with plastic mulching improves compensation of intercropped maize in arid environment , 2017 .

[51]  B. Ma,et al.  Leaf and canopy optical characteristics as crop-N-status indicators for field nitrogen management in corn. , 2010 .

[52]  Praveen-Kumar,et al.  Improving water and land use efficiency of fallow-wheat system in shallow Lithic Calciorthid soils of arid region: Introduction of bed planting and rainy season sorghum–legume intercropping , 2014 .

[53]  Z. Zhu,et al.  Nitrogen fertilizer use in China – Contributions to food production, impacts on the environment and best management strategies , 2002, Nutrient Cycling in Agroecosystems.

[54]  M. Ashraf,et al.  Photosynthesis under stressful environments: An overview , 2013, Photosynthetica.

[55]  R. W. Willey.  Intercropping Its Importance And Research Needs Part 1. Competition And Yield Advantages Vol-32 , 1979 .

[56]  J. Nagy,et al.  Growth and yield of cotton in response to a free-air carbon dioxide enrichment (FACE) environment , 1994 .

[57]  Aiwang Duan,et al.  Distribution of roots and root length density in a maize/soybean strip intercropping system , 2010 .

[58]  I. Ahmad,et al.  Plastic film mulching stimulates soil wet-dry alternation and stomatal behavior to improve maize yield and resource use efficiency in a semi-arid region , 2019, Field Crops Research.

[59]  C. Wang,et al.  Effects of nitrogen fertilizer and planting density on the leaf photosynthetic characteristics, agronomic traits and grain yield in common buckwheat (Fagopyrum esculentum M.) , 2018 .