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Interspecific interactions affect N and P uptake rather than N:P ratios of plant species:evidence from intercropping

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Journal of Plant Ecology 2022年第2期15卷 223-236页

作者： Wei-Ping Zhang Dario Fornara Guang-Cai Liu Josep Peñuelas Jordi Sardans Jian-Hao Sun Li-Zhen Zhang Long Li Beijing Key Laboratory of Biodiversity and Organic Farming Key Laboratory of Plant and Soil InteractionsMinistry of EducationDepartment of Ecology and Ecological EngineeringCollege of Resource and Environmental ScienceChina Agricultural UniversityBeijing 100193China Sustainable Agri-Food Science Division Agri-Food&Biosciences InstituteBT95PX BelfastUK CSIC Global Ecology Unit CREAF-CSIC-UAB08913 BellaterraCataloniaSpain CREAF 08913 Cerdanyola del VallèsCataloniaSpain Institute of Soil Fertilizer and Water-Saving AgricultureGansu Academy of Agricultural SciencesLanzhou 730070China Gansu Agro-technology Extension Station Lanzhou 730020China

Quantifying stoichiometry of crop N and P acquisition(*** from farmland)under different agronomic practices is essential for understanding nutrient budgets and optimizing N and P fertilizer application in *** is not clear how plant N and P uptake and N:P stoichiometry vary between monoculture and intercropping throughout an entire growing season under different N fertilization and mulching ***,we addressed how plant interspecific competition for nutrients have affected the temporal dynamics of crop N and P uptake(and N:P ratios)in five cropping systems(wheat,maize and barley monocultures,and wheat/maize and barley/maize intercropping),under two N levels(0 and 225 kg N ha^(−1))and two maize mulching treatments(with and without).Wheat and barley had greater N and P competitive ability than maize,leading to an increase in N and P uptake of wheat and barley and a decrease in N and P uptake of maize during co-growth stages in intercropping.N:P ratios of three crop species decreased with plant ***-level N:P ratios were either not affected by intercropping or did not change consistently with N fertilization while film mulching decreased maize N:P ***-level N:P ratios of the two intercrops were different from those of the corresponding monoculture at ***(i)the proportion of N and P removal from intercropping differs from monocultures,and(ii)N and P uptake by crops is decoupled under N fertilization and mulching,these findings may have practical implications for the nutrient budget of intercropping systems.

关键词： ecological stoichiometry growth-rate hypothesis intercropping system interspecific competition nitrogen addition nutrient budget plastic film mulch

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Effects of Maize-Soybean intercropping on Nitrous Oxide Emissions from a Silt Loam Soil in the North China Plain

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Pedosphere 2019年第6期29卷 764-772页

作者： HUANG Jianxiong SUI Peng GAO Wansheng CHEN Yuanquan College of Agriculture and Biotechnology China Agricultural UniversityNo.2 Yuanmingyuan West RoadHaidian DistrictBeijing 100193(China Rubber Research Institute Chinese Academy of Tropical Agricultural SciencesDanzhou 571737(China

Maize ( Zea mays L.), a staple crop in the North China Plain, contributing substantially to agricultural nitrous oxide (N 2 O) emissions in this region. Many studies have focused on various agricultural management measures to reduce N 2 O emissions. However, few have investigated soil N 2 O emissions in intercropping systems. In the current study, we investigate whether maize-soybean intercropping treatments could reduce N 2 O emission rates. Two differently configured maize-soybean intercropping treatments, 2:2 intercropping (two rows of maize and two rows of soybean, 2M2S) and 2:1 intercropping (two rows of maize and one row of soybean, 2M1S), and monocultured maize (M) and soybean (S) treatments were performed using a static chamber method. The results showed no distinct yield advantage for the intercropping systems. The total N 2 O production from the various treatments was 0.15 ± 0.04–113.85 ± 12.75 µg m −2 min −1 . The cumulative N 2 O emission from the M treatment was 16.9 ± 2.3 kg ha −1 over the entire growing season (three and a half months), which was significantly higher ( P intercropping treatments during the growing season. These results indicate that maize-soybean intercropping can reduce soil N 2 O emissions relative to monocultured maize.

关键词： Climate change Denitrification intercropping system Land equivalent ratio Nitrification Nitrous oxide flux Soil temperature Soil water-filled pore space

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Profitability Level and Determinants of Tea intercropping in Taraba State

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Macro Management & Public Policies 2023年第2期5卷 45-51页

作者： Oladokun Yetunde O.M Oluyole Kayode A. Economics and Extension Department Cocoa Research Institute of NigeriaIdi-AyunreKM14 Ibadan/Ijebu-Ode RoadP.M.B 5244IbadanNigeria

intercropping involves the cultivation of more than one crop on a plot of land at a particular *** intercropping with other crops can increase the profitability of farmers and the development of tea *** study estimated the profitability level of intercropped tea farms and determined the factors affecting the profitability of tea intercropping systems in the study *** was obtained from two hundred and four tea farmers using a well-structured *** analytical techniques used in the study were descriptive analysis and linear *** results revealed that the majority(95.6%)of the farmers are from Kakara and Nyiwa *** are few(2.9%)women involved in tea farming in Taraba State.29%of the tea farmers are young less than 30 years and old above 60 *** percent of the farmers are single,83.8%are married and 1.5%are *** 40%of the tea farmers had no formal education,21%have between 1-6 years of education,19%had 7-12 years of education and 21%had greater than 12 years of *** gross margin is N289,900,581.9 and the gross margin per farmer is N1,421,*** net income is N2,879,055,533.3 and the net income per farmer is N1,411,*** amount of profit tea farmers make in Taraba State is N1,425,001 and the profit per farmer is N6,*** costs(weeding,pruning,application of insecticide,watering)and cost of materials(cutlass,file,chemical,bag and others)are significant determinants of the profit level of the tea intercropping system in Taraba *** intercropping farming is profitable in Taraba State Nigeria.

关键词： Determinants intercropping system Profit Tea

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