Evaluation of cotton N nutrition status based on critical N dilution curve, N uptake and residual under different drip fertigation regimes in Southern Xinjiang of China

2021 ◽  
Vol 256 ◽  
pp. 107134
Author(s):  
Xianghao Hou ◽  
Youzhen Xiang ◽  
Junliang Fan ◽  
Fucang Zhang ◽  
Wenhui Hu ◽  
...  
Keyword(s):  
N Uptake ◽  
Nutrition Status ◽  
Dilution Curve ◽  
N Nutrition ◽  
Xinjiang Of China ◽  
Southern Xinjiang ◽  
Drip Fertigation

Responses of Rice (Oryza sativa L.) Nitrogen Status Indicators to Nitrogen Rates during the Different Rice Growth Stages

2013 ◽  
Vol 726-731 ◽  
pp. 4411-4417 ◽  
Author(s):  
Qing Wen Zhang ◽  
Zheng Li Yang ◽  
Ai Ping Zhang ◽  
Ming Wang
Keyword(s):  
N Uptake ◽  
Nutrition Status ◽  
Growth Stages ◽  
N Availability ◽  
Regression Equations ◽  
N Application ◽  
N Nutrition ◽  
Application Rates ◽  
Significant Regression ◽  
Nitrogen Rates

The SPAD was shown as a diagnostic tool to assess the nitrogen (N) nutrition status. The objective of this study is to evaluate the performance of SPAD as N nutrition status for rice. We conducted two years field experiment in the Ningxia irrigation area. Five N application rates were applied to rice to obtain contrasting conditions of N availability. The leaves N concentrations, SPAD and N uptake by rice were assessed. The results showed that response of SPAD to N uptake rate depends on the developmental stage of the rice. The peak periods for N uptake by rice were the jointing-booting stage to the flowering stage. Significant regression equations were established between SPAD and N uptake. The SPAD meter was demonstrated to be a useful nondestructive system to aid in the evaluation of N nutrition status in rice. However, consistency in sample seasonal timing may necessitate to correlate SPAD values.

scholarly journals Use of an Active Canopy Sensor Mounted on an Unmanned Aerial Vehicle to Monitor the Growth and Nitrogen Status of Winter Wheat

2020 ◽  
Vol 12 (22) ◽  
pp. 3684
Author(s):  
Jie Jiang ◽  
Zeyu Zhang ◽  
Qiang Cao ◽  
Yan Liang ◽  
Brian Krienke ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Dry Matter ◽  
Vegetation Index ◽  
Nutrition Status ◽  
Growth Stages ◽  
Growth Indices ◽  
N Accumulation ◽  
N Nutrition ◽  
Red Edge ◽  
Aerial Vehicle

Using remote sensing to rapidly acquire large-area crop growth information (e.g., shoot biomass, nitrogen status) is an urgent demand for modern crop production; unmanned aerial vehicle (UAV) acts as an effective monitoring platform. In order to improve the practicability and efficiency of UAV based monitoring technique, four field experiments involving different nitrogen (N) rates (0–360 kg N ha−1) and seven winter wheat (Triticum aestivum L.) varieties were conducted at different eco-sites (Sihong, Rugao, and Xinghua) during 2015–2019. A multispectral active canopy sensor (RapidSCAN CS-45; Holland Scientific Inc., Lincoln, NE, USA) mounted on a multirotor UAV platform was used to collect the canopy spectral reflectance data of winter wheat at key growth stages, three growth parameters (leaf area index (LAI), leaf dry matter (LDM), plant dry matter (PDM)) and three N indicators (leaf N accumulation (LNA), plant N accumulation (PNA) and N nutrition index (NNI)) were measured synchronously. The quantitative linear relationships between spectral data and six growth indices were systematically analyzed. For monitoring growth and N nutrition status at Feekes stages 6.0–10.0, 10.3–11.1 or entire growth stages, red edge ratio vegetation index (RERVI), red edge chlorophyll index (CIRE) and difference vegetation index (DVI) performed the best among the red edge band-based and red-based vegetation indices, respectively. Across all growth stages, DVI was highly correlated with LAI (R2 = 0.78), LDM (R2 = 0.61), PDM (R2 = 0.63), LNA (R2 = 0.65) and PNA (R2 = 0.73), whereas the relationships between RERVI (R2 = 0.62), CIRE (R2 = 0.62) and NNI had high coefficients of determination. The developed models performed better in monitoring growth indices and N status at Feekes stages 10.3–11.1 than Feekes stages 6.0–10.0. To sum it up, the UAV-mounted active sensor system is able to rapidly monitor the growth and N nutrition status of winter wheat and can be deployed for UAV-based remote-sensing of crops.

scholarly journals Species Interactions Improve Above-Ground Biomass and Land Use Efficiency in Intercropped Wheat and Chickpea under Low Soil Inputs

Agronomy ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 765 ◽  
Author(s):  
Latati ◽  
Dokukin ◽  
Aouiche ◽  
Rebouh ◽  
Takouachet ◽  
...  
Keyword(s):  
Land Use ◽  
Durum Wheat ◽  
N Uptake ◽  
P Uptake ◽  
Above Ground Biomass ◽  
N Nutrition ◽  
Ground Biomass ◽  
Land Use Efficiency ◽  
Sole Cropping ◽  
Use Efficiency

Little is known about how the performance of legumes symbiosis affects biomass and nutrient accumulation by intercropped cereals under the field condition. To assess the agricultural services of an intercropping system; durum wheat (Triticum turgidum durum L.cv. VITRON) and chickpea (Cicer arietinum L.cv. FLIP 90/13 C) were cultivated as both intercrops and sole cropping during two growing seasons under the field trial, to compare plant biomass, nodulation, N and phosphorus (P) uptake, and N nutrition index. Both the above-ground biomass and grain yield and consequently, the amount of N taken up by intercropped durum wheat increased significantly (44%, 48%, and 30%, respectively) compared with sole cropping during the two seasons. However, intercropping decreased P uptake by both durum wheat and chickpea. The efficiency in use of rhizobial symbiosis (EURS) for intercropped chickpea was significantly higher than for chickpea grown as sole cropping. The intercropped chickpea considerably increased N (49%) and P (75%) availability in durum wheat rhizosphere. In the case of chickpea shoot, the N nutrition (defined by the ratio between actual and critical N uptake by crop) and acquisition were higher in intercropping during only the first year of cropping. Moreover, biomass, grin yield, and resource (N and P) use efficiency were significantly improved, as indicated by higher land equivalent ratio (LER > 1) in intercropping over sole cropping treatments. Our findings suggest that change in the intercropped chickpea rhizosphere-induced parameters facilitated P and N uptake, above-ground biomass, grain yield, and land use efficiency for wheat crop.

Site-specific growth and nutrition of planted Piceamariana in the Ontario Clay Belt. III. Biomass and nutrient allocation

1990 ◽  
Vol 20 (8) ◽  
pp. 1165-1171 ◽  
Author(s):  
Alison D. Munson ◽  
V. R. Timmer
Keyword(s):  
Black Spruce ◽  
N Uptake ◽  
Nutrient Use Efficiency ◽  
Nutrient Content ◽  
Nutrient Allocation ◽  
Individual Element ◽  
N Nutrition ◽  
Multivariate Procedures ◽  
Nutrient Retranslocation ◽  
The Individual

First and second-season morphological responses of outplanted Piceamariana (Mill.) B.S.P. (black spruce) seedlings to site conditions of three cutover boreal ecosystems were analysed in terms of biomass and nutrient allocation to structural components (current shoots, previous year's shoots, stem, and roots). Improved N nutrition on an upland Feathermoss site had the greatest positive effect on biomass and nutrient allocation to current shoots, while allocation to other components was reduced. Seedlings on lowland Alnus – Herb poor and Ledum sites responded to site nutrient stress by allocating more biomass to the stem and roots. Multivariate procedures indicated that the overall pattern of biomass and nutrient allocation was significantly affected by site, and also differed depending on the individual element considered (N, P, K, Ca, Mg). Changes in nutrient-use efficiency with site were also investigated. With decreased seedling N uptake on the two lowland sites, biomass production per unit N increased, but specific absorption rate of roots decreased. Under N limitation, evidence for nutrient retranslocation was noted by decreases in nutrient content in the same component over 2 years and by lower concentrations in older shoots than in current growth. The alternative allocation of biomass and nutrients to seedling components with changes in site nutrition has implications for tree development on specific sites, and also for management of site nutrient regime to improve early seedling performance.

scholarly journals Combining Green Manuring and Fertigation Maximizes Tomato Crop Yield and Minimizes Nitrogen Losses

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 977
Author(s):  
Michela Farneselli ◽  
Paolo Benincasa ◽  
Giacomo Tosti ◽  
Marcello Guiducci ◽  
Francesco Tei
Keyword(s):  
Cover Crops ◽  
N Uptake ◽  
Growth And Yield ◽  
Winter Period ◽  
N Leaching ◽  
Tomato Crop ◽  
N Nutrition ◽  
Green Manuring ◽  
Processing Tomato ◽  
Environmentally Sound

The aim of this experiment was to evaluate the effect of fertilizing processing tomato by coupling the green manuring of fall-winter cover crops with fertigation in spring-summer. In a two-year experiment, seven fertilization treatments were compared: green manuring of pure barley (B100) and pure vetch (V100) sown at 100% of their ordinary seeding rates, green manuring of a barley-vetch mixture at a ratio of 75:25 of their own seed rates (B75V25), fertigation with drip irrigation at a rate of 200 kg ha−1 of nitrogen (N) (Fert_N200), fertigation combined with B100 and B75V25 at a N rate complementary to 200 kg N ha−1 (B100 + Fert and B75V25 + Fert, respectively), and an unfertilized control (N0) with no cover crops for green manuring prior to tomato transplanting or fertigation. The Fert_N200 treatment resulted in maximum tomato N uptake, growth and yield, but caused high N leaching, especially during the no-cover fall-winter period, as was also the case for N0. The V100 treatment promoted quite good tomato N status and yield, but did not reduce N leaching. The B100 and B75V25 treatments reduced N leaching but decreased tomato N uptake, growth and yield. The B100 + Fert and B75V25 + Fert treatments reduced N leaching, likely increased soil N stock, and facilitated optimal tomato N nutrition and maximum yields. Combining fertigation with green manuring of cover crops composed of pure grass or grass-legume mixtures appears to be a very effective and environmentally sound practice for fertilizing high N-demanding spring-summer crops like processing tomato.

Integration of nitrate cover crops into sugarbeet (Beta vulgaris) rotations. II. Effect of cover crops on growth, yield and N requirement of sugarbeet

1998 ◽  
Vol 130 (1) ◽  
pp. 61-67 ◽  
Author(s):  
M. F. ALLISON ◽  
M. J. ARMSTRONG ◽  
K. W. JAGGARD ◽  
A. D. TODD
Keyword(s):  
Cover Crops ◽  
N Uptake ◽  
Maximum Yield ◽  
N Fertilizer ◽  
Processing Quality ◽  
Soil Mineral Nitrogen ◽  
Nitrogen Response ◽  
N Nutrition ◽  
Fertilizer Requirement ◽  
The Mean

Between 1989 and 1993, 17 experiments tested the effects of autumn-sown cover crops on the yield, processing quality and N nutrition of subsequent sugarbeet crops. Cover crops had no effect on sugarbeet plant population density or pesticide requirement. In nitrogen response experiments, the mean beet yield at the economic optimum was 83 t/ha. The mean N fertilizer requirement was 96 kg N/ha and the N uptake at maximum yield averaged 180 kg N/ha. Cover crops had no effect on yield, fertilizer requirement or N uptake. In addition, cover crops generally had no effect on the efficiency of N fertilizer use, the mineralization of N from the soil organic matter nor the amount of soil mineral nitrogen at sowing or at harvest of the beet crop. Processing quality was also not affected by cover crops. The cost of growing a cover crop ranged from 0 to 50 £/ha. Since these costs cannot be offset against increases in yields or reduced fertilizer application rates, cover crops need to be low cost, i.e. cheap seed and minimal cultivation. Cover crops using volunteer cereals and weeds or farm-saved grain that are established with a single stubble-cultivation should fulfil these criteria.

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