Optimizing the synthetic nitrogen rate to balance residual nitrate and crop yield in a leguminous green-manured wheat cropping system

2018 ◽  
Vol 631-632 ◽  
pp. 1234-1242 ◽  
Author(s):  
Zhiyuan Yao ◽  
Dabin Zhang ◽  
Pengwei Yao ◽  
Na Zhao ◽  
Yangyang Li ◽  
...  
Keyword(s):  
Crop Yield ◽  
Cropping System ◽  
Nitrogen Rate ◽  
Residual Nitrate

Simple linear regression.

2021 ◽  
pp. 80-145
Author(s):  
Edward F. Durner
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Crop Yield ◽  
Repeated Measures ◽  
Polynomial Regression ◽  
Linear Regression Analysis ◽  
Confidence Bands ◽  
Simple Linear Regression ◽  
Nitrogen Rate ◽  
Mathematical Equations

Abstract This chapter covers the methods for obtaining and expressing these mathematical equations and their confidence bands. The methodology is linear regression analysis. Four types of regression analysis are presented, including: simple linear regression with no repeated measures or replication; simple linear regression with repeated measures; simple linear regression with replication; and polynomial regression. The effects of nitrogen rate on crop yield were presented as example.

scholarly journals Substitution of Inorganic Nitrogen Fertilizer with Green Manure (GM) Increased Yield Stability by Improving C Input and Nitrogen Recovery Efficiency in Rice Based Cropping System

Agronomy ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 609 ◽  
Author(s):  
Qaswar ◽  
Jing ◽  
Ahmed ◽  
Shujun ◽  
Dongchu ◽  
...  
Keyword(s):  
Crop Yield ◽  
Green Manure ◽  
Inorganic Nitrogen ◽  
Cropping System ◽  
N Fertilization ◽  
Yield Stability ◽  
N Fertilizer ◽  
Yield Variability ◽  
Variability Index ◽  
Double Rice

A long-term field experiment was carried out (since 2008) for evaluating the effects of different substitution rates of inorganic nitrogen (N) fertilizer by green manure (GM) on yield stability and N balance under double rice cropping system. Treatments included, (1) N0 (no N fertilizer and no green manure); (2) N100 (recommended rate of N fertilizer and no green manure); (3) N100-M (recommended rate of N fertilizer and green manure); (4) N80-M (80% of recommended N fertilizer and green manure); (5) N60-M (60% of recommended N fertilizer and green manure); and (6) M (green manure without N fertilization). Results showed that, among all treatments, annual crop yield under N80-M treatment was highest. Crop yield did not show significant differences between N100-M and N80-M treatments. Substitution of different N fertilizer rates by GM reduced the yield variability index. Compared to the N0 treatment, yield variability index of early rice under N100-M, N80-M, and N60-M treatments was decreased by 11%, 26%, and 36%, respectively. Compared to the N0 treatment, yield variability index of late rice was decreased by 12%, 38%, 49%, 47%, and 24% under the N100, N100-M, N80-M, N60-M, and M treatments, respectively. During period of 2009–2013 and 2014–2018, nitrogen recovery efficiency (NRE) was highest under N80-M treatment and N balance was highest under N100 treatment. NRE of all treatments with GM was increased over the time from 2009–2013 to 2014–2018. All treatments with GM showed increasing trend of SOC over the years. Substitution of N fertilizer by GM also increased C inputs and soil C:N ratio compared to the N100 and N0 treatments. Boosted regression model indicated that C input, N uptake and AN were most influencing factors of crop yield. Thus, we concluded that N fertilization rates should be reduced by 20% under GM rotation to attain high yield stability of double rice cropping system through increasing NRE and C inputs.

Crop yield and N2O emission affected by long-term organic manure substitution fertilizer under winter wheat-summer maize cropping system

2020 ◽  
Vol 732 ◽  
pp. 139321
Author(s):  
Fenglian Lv ◽  
Jiashan Song ◽  
Donna Giltrap ◽  
Yongtao Feng ◽  
Xueyun Yang ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Crop Yield ◽  
Cropping System ◽  
N2o Emission ◽  
Organic Manure ◽  
Summer Maize

scholarly journals Responses of N<sub>2</sub>O and CH<sub>4</sub> fluxes to fertilizer nitrogen addition rates in an irrigated wheat-maize cropping system in northern China

2011 ◽  
Vol 8 (5) ◽  
pp. 9577-9607 ◽  
Author(s):  
C. Liu ◽  
K. Wang ◽  
X. Zheng
Keyword(s):  
Crop Yield ◽  
Linear Models ◽  
Crop Yields ◽  
Cropping System ◽  
Northern China ◽  
Field Studies ◽  
N2o Emissions ◽  
Fertilizer Rate ◽  
Irrigated Wheat ◽  
Fertilizer Rates

Abstract. Model and field studies generally posit that when the application rates of nitrogen fertilizer exceed crop needs, nitrous oxide (N2O) emissions will increase nonlinearly, though linear responses are also extensively reported by field studies. We conducted year-round measurements of crop yield, N2O and methane (CH4) fluxes for treatments of six nitrogen levels (0, 135, 270, 430, 650 and 850 kg N ha−1 yr−1 in the form of urea) in a typical irrigated wheat-maize rotation field in northern China. Linear models characterized the responses of cumulative N2O emissions to fertilizer rates well; therefore, the calculated N2O emission factors of 0.17 ± 0.03%, 0.73 ± 0.07% and 0.49 ± 0.06% for the wheat season, maize season and annual scale, respectively, were appropriate for the different fertilizer rates. The cumulative CH4 uptake by the soil tended to be enhanced at higher fertilizer rates (≥350 kg N ha−1) in the maize season whereas no effect was observed for the wheat season. The crop yields stopped increasing at fertilizer rates greater than 650 kg N ha−1 yr−1. When the annual fertilizer rates increased from 270 to 430, from 270 to 650 and from 270 to 850 kg N ha−1 yr−1, the crop yields increased only 4–15% (0.6–2.2 t ha−1 yr−1), but cumulative N2O emissions increased 36–115 % (0.9–3.0 kg N ha−1 yr−1). We recommend 270 kg N ha−1 yr−1 as the locally optimum fertilizer rate. Considering the N inputs by fertilization (270 kg N ha−1 yr−1), irrigation (4.3 ± 0.2 kg N ha−1 yr−1) and deposition (wet deposition: 30.5 ± 1.5 kg N ha−1 yr−1), the slightly positive soil N balance could maintain the current crop yield (>14 t ha−1 yr−1) and reduce the present high N2O emissions (>3.51 kg N ha−1 yr−1) of the local farmers' practice (fertilizer rate: >430 kg N ha−1 yr−1).

scholarly journals Increased Crop Yield Affected the Improved Cropping System in Agriculture Dry Land

2020 ◽  
pp. 105-110
Author(s):  
. Rohit ◽  
Jitendra Singh
Keyword(s):  
Crop Yield ◽  
Cropping Systems ◽  
Cropping System ◽  
Dry Land ◽  
Chick Pea ◽  
Net Returns ◽  
Horizontal Spread ◽  
On Farm

The present study evaluate and disseminate the improved rainfed cropping systems, on farm trials and demonstration was conducted at National Innovations on Climate Resilient Agriculture (NICRA) village Nagla Dulhe Khan. Yield of dry land crops is very low due to various reasons. Farm trials were conducted to evaluate different cropping system practices at village Nagla Dulhe Khan. Trials and demonstrations were carried out at farmer’s field to show the worth of improved cropping system practices for horizontal spread of improved agro-technologies. 54.5 percent increased in the yield was found by adopting intercropping of chick pea and mustard (5:1). Improved cropping system practiced resulted in higher yield, higher net returns and higher B: C ratio over farmers practice.

scholarly journals Effects of nematicides on nematode population densities and crop yield in a turnip-corn-pea cropping system

2005 ◽  
Vol 71 (2) ◽  
pp. 55-63 ◽  
Author(s):  
A.W. Johnson ◽  
C.C. Dowler ◽  
N. C. Glaze ◽  
D.R. Summer ◽  
R. B. Chalfant ◽  
...  
Keyword(s):  
Zea Mays ◽  
Crop Yield ◽  
Brassica Campestris ◽  
Cropping System ◽  
Nematode Population ◽  
Management Systems ◽  
Intensive Management ◽  
Population Densities ◽  
Methyl Isothiocyanate ◽  
Meloidogyne Spp

Four management systems were evaluated in a six-year study to control nematodes in a turnip-corn-pea annual cropping System on plots of Tifton loamy sand naturally infested with Meloidogyne spp. (about 90 % M. incognita and 10% M. hapla), Pratylenchus spp. (about 65% P. scribneri, 25% P. brachyurus, and 10% P. zeae), Paratrichodorus minor and Criconemella ornata. Turnip (Brassica campestris subsp. rapifera) supported low numbers of all nematodes. 'Pioneer 3369A' corn (Zea mays) supported greater numbers of all nematodes than 'Funks G-4507'. Population densities of Meloidogyne spp. juveniles (J2) were suppressed below 80 per 150 cm3 of soil by 98 % methyl bromide + 2 % chloropicrin and 20 % methyl isothiocyanate + 80 % chlorinated C3 hydrocarbons on turnip and corn, and increased rapidly on 'Pinkeye purplehull', but not on a resistant cultivar, 'Worthmore' pea (Vigna unguiculata). Population densities of other nematodes were not affected by cultivar of pea or the nematicide, ethoprop. Fenamiphos was more effective than ethoprop in suppressing nematode population densities. Increases in crop yield in the intensive management system ranged from 4% to 52% over untreated controls.

Sign in / Sign up

Export Citation Format

Share Document