Improving in-season estimation of rice yield potential and responsiveness to topdressing nitrogen application with Crop Circle active crop canopy sensor

A pot culture experiment was conducted at the Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during kharif II, 2012 to evaluate the nodulation, biological nitrogen fixation and yield potential of genotypes of mungbean under varying levels of N application. There were 10 mungbean genotypes viz. IPSA 12, GK 27, IPSA 3, IPSA 5, ACC12890055, GK 63, ACC12890053, BU mug 4, BARI Mung 6 and Binamoog 5, each genotype treated with six levels of N (0, 20, 40, 60, 80 and 100 kg N ha-1) . Among the genotypes, the IPSA 12 at 40 kg N ha-1 produced the maximum number of nodules (14.54 plant-1) as well as the highest nitrogen fixation (2.684 mmol C2H4). This resulted in the highest seed yield (14.22 g plant-1). The genotype ACC12890053 recorded the lowest nodulation (6 plant-1), nitrogen fixation (1.134) and seed yield (7.33 g plant-1).Bangladesh J. Agril. Res. 41(1): 163-171, March 2016

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Optimum Planting Density and Nitrogen Application Rate for Maximizing Rice Yield in the Nile Delta

Japanese Journal of Crop Science ◽

10.1626/jcs.72.133 ◽

2003 ◽

Vol 72 (2) ◽

pp. 133-141 ◽

Cited By ~ 5

Author(s):

Teruhisa NAMBA

Keyword(s):

Nile Delta ◽

Rice Yield ◽

Application Rate ◽

Planting Density ◽

Nitrogen Application ◽

Nitrogen Application Rate

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Functional Characterization of Genes/QTLs for Increasing Rice Yield Potential

Rice - Germplasm, Genetics and Improvement ◽

10.5772/56820 ◽

2014 ◽

Cited By ~ 1

Author(s):

Jie-Zheng Ying ◽

Yu-Yu Chen ◽

Hong-Wei Zhang

Keyword(s):

Rice Yield ◽

Functional Characterization ◽

Yield Potential

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Influence of agronomic practices on canopy microclimate and septoria development in no-till winter wheat produced in the Parkland region of Saskatchewan

Canadian Journal of Plant Science ◽

10.4141/cjps93-050 ◽

1993 ◽

Vol 73 (1) ◽

pp. 331-344 ◽

Cited By ~ 16

Author(s):

D. K. Tompkins ◽

D. B. Fowler ◽

A. T. Wright

Keyword(s):

Triticum Aestivum ◽

Winter Wheat ◽

Air Temperature ◽

Flag Leaf ◽

Septoria Tritici ◽

Yield Potential ◽

High Yield ◽

Crop Canopy ◽

No Till ◽

N Fertility

In areas with favourable growing conditions, high seeding rates (SRs), narrow row spacings (RSs) and nitrogen fertilization (N) are required before high yield potentials of winter wheat (Triticum aestivum L.) are realized. Changes in these variables produce changes in crop-canopy microclimate that may influence the development of foliar pathogens. This study examined the relative differences in crop-canopy microclimates due to different RS and SR combinations and determined the effect of SR, RS and N fertility on septoria (Septoria nodorum Berk. and Septoria tritici Rob. ex Desm.) development on normal height and semi-dwarf cultivars grown under no-till in the Parkland region of Saskatchewan. The daily mean value for solar radiation penetrating to the base of the crop canopy was 1100 μmol m−2 s−1 for 36-cm RS. This was 30% higher than the 845 μmol m−2 s−1 observed for 9-cm RS. The increased light interception by the canopy was associated with higher dry matter production and grain yield. During peak periods, wind speed was 56% higher within the 36-cm RS canopy than within the 9-cm RS canopy. Increased duration of leaf wetness was associated with 9-cm RS and 140-kg-ha−1 SR treatment. Cooler air temperature and higher RH within the canopy occurred for the 9-cm RS – 140-kg-ha−1 SR treatment. Differences in air temperature and RH between the 9-cm RS – 140-kg-ha−1 SR and the 36-cm RS – 35-kg-ha−1 SR treatments were smaller at night and greater during the day. The maximum differences occurred at mid-morning and mid-afternoon, when the 9-cm RS – 140-kg-ha−1 SR canopy was 1.5 °C cooler and had a 4.5% higher RH than the 36-cm RS – 35-kg-ha−1 SR canopy. Septoria severity increased when SR increased from 35 kg ha−1 to 140 kg ha−1. Septoria severity was not influenced by RS. Septoria severity was greater on the flag leaf of the semi-dwarf cultivar Norwin than on the tall cultivar Norstar. Increased N fertility reduced septoria severity in one trial. These observations demonstrated that, in addition to the influence on yield potential, high SR and narrow RS produce a canopy microclimate that is favourable for the development of septoria. Key words: Seed rate, row spacing, N fertility, Septoria sp., Triticum aestivum, canopy microclimate

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The Effects of Returning Straw and Milk Vetch on Rice Growth and Greenhouse Gas Emissions

Research in Ecology ◽

10.30564/re.v3i2.3267 ◽

2021 ◽

Vol 3 (2) ◽

Author(s):

Lijin Zhang ◽

Guoqin Huang

Keyword(s):

Greenhouse Gas ◽

Rice Yield ◽

N2o Emission ◽

Emission Flux ◽

Nitrogen Application ◽

Cross Combination ◽

Ch4 Emissions ◽

Combined Action ◽

Set Up ◽

Late Rice

The effects of different nitrogen application levels on rice yield and greenhouse gas (NO2, CH4) emissions from rice fields under the combined action of straw and milk vetch. Two treatments were set up in the main area of this experiment: R0 (no straw returned to the field, 0); R1 (amount of straw returned to the field under normal conditions, 6000kg·hm-2). Before turning the straw back into the field, use a circular knife to cut the straw into 10~13cm.And 3 kinds of nitrogen application treatments in the sub-district: N1 (no nitrogen application, 0), N2 (nitrogen application, 15 kg·hm-2), N3 (nitrogen application, 30kg·hm-2), two-factor cross-combination,and a non-nitrogen control CK, total of 7 treatments. The results showed that in 2017, early rice R1N2 treatment increased the most obvious yield, which was 32.44% higher than CK, and late rice R1N1 treatment increased the most significantly, which was 17.91% higher than CK. CH4 emissions is positively correlated with the amount of straw returned to the field, while the amount of N2O is the opposite.The N2O emission flux was highest in the treatment of R1N3, and the CH4 emission flux was the highest in the treatment of R1N2.

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Field-Scale Rice Yield Estimation Using Sentinel-1A Synthetic Aperture Radar (SAR) Data in Coastal Saline Region of Jiangsu Province, China

Remote Sensing ◽

10.3390/rs11192274 ◽

2019 ◽

Vol 11 (19) ◽

pp. 2274 ◽

Cited By ~ 2

Author(s):

Jianjun Wang ◽

Qixing Dai ◽

Jiali Shang ◽

Xiuliang Jin ◽

Quan Sun ◽

...

Keyword(s):

Synthetic Aperture Radar ◽

Rice Yield ◽

Data Access ◽

Jiangsu Province ◽

Growth And Yield ◽

Synthetic Aperture ◽

Yield Potential ◽

Yield Estimation ◽

Free Data ◽

Aperture Radar

In recent years, a large number of salterns have been converted into rice fields in the coastal region of Jiangsu Province, Eastern China. The high spatial heterogeneity of soil salinity has caused large within-field variabilities in grain yield of rice. The identification of low-yield areas within a field is an important initial step for precision farming. While optical satellite remote sensing can provide valuable information on crop growth and yield potential, the availability of cloud-free optical image data is often hampered by unfavorable weather conditions. Synthetic aperture radar (SAR) offers an alternative due to its nearly day-and-night and all-weather capability in data acquisition. Given the free data access of the Sentinels, this study aimed at developing a Sentinel-1A-based SAR index for rice yield estimation. The proposed SAR simple difference (SSD) index uses the change of the Sentinel-1A backscatter in vertical-horizontal (VH) polarization between the end of the tillering stage and the end of grain filling stage (SSDVH). A strong exponential relationship has been identified between the SSDVH and rice yield, producing accurate yield estimation with a root mean square error (RMSE) of 0.74 t ha−1 and a relative error (RE) of 7.93%.

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Capability of crop canopy sensing to predict crop parameters of cut grass swards aiming at early season variable rate nitrogen top dressings

Advances in Animal Biosciences ◽

10.1017/s2040470017001364 ◽

2017 ◽

Vol 8 (2) ◽

pp. 792-795 ◽

Cited By ~ 2

Author(s):

G. Portz ◽

M. L. Gnyp ◽

J. Jasper

Keyword(s):

Cross Validation ◽

N Uptake ◽

Calibration Data ◽

Variable Rate ◽

Nitrogen Application ◽

Crop Canopy ◽

Validation Data ◽

Intensively Managed ◽

Independent Calibration ◽

Crop Parameters

This study aims to evaluate actual biomass and N-uptake estimates with the Yara N-Sensor in intensively managed grass swards across several trial sites in Europe. The dataset was split by location into an independent calibration data (UK and Finland) and a validation data (Germany) for the first two cuts. Yara N-Sensor readings were better correlated with N-uptake (R2=0.71) than actual biomass (R2=0.53) for the 1st cut. At the 2nd cut, the R2 values for both parameters were higher (0.80 and 0.56). A cross-validation with a German grass trial indicated the potential for predicting N-uptake (R2>0.8). It can be concluded that the technology has the potential to guide management decisions and variable rate nitrogen application on European grass swards.

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