Optimization for Vis/NIRS Prediction Model of Soil Available Nitrogen Content

2018 ◽  
Vol 39 (7) ◽  
pp. 1016-1023 ◽  
Author(s):  
汪六三 WANG Liu-san ◽  
鲁翠萍 LU Cui-ping ◽  
王儒敬 WANG Ru-jing ◽  
黄伟 HUANG Wei ◽  
郭红燕 GUO Hong-yan ◽  
...  
Keyword(s):  
Prediction Model ◽  
Nitrogen Content ◽  
Available Nitrogen ◽  
Soil Available Nitrogen

scholarly journals Effects of Soil Physico-Chemical Properties on Plant Species Composition and Diversity Along an Elevation Gradient Over Alpine Grassland on the Qinghai-Tibetan Plateau, China

2021 ◽  
Author(s):  
Wangya Han ◽  
Li Chen ◽  
Xukun Su ◽  
Dan Liu ◽  
Tiantian Jin ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Nitrogen Content ◽  
Plant Species ◽  
Chemical Properties ◽  
Alpine Grassland ◽  
Plant Species Composition ◽  
Available Nitrogen ◽  
Physico Chemical ◽  
Soil Available Nitrogen

Abstract Background and aims Alpine grassland on the Qinghai-Tibetan Plateau (QTP) is sensitive and fragile, and it is subject to serious degradation. It is essential to determine the effects of soil parameters on plant species to explain grassland degradation. Methods We classified plant communities into six types based on hierarchical clustering. Then we analyzed the effects of soil physico-chemical properties on plant species composition and diversity by canonical ordination and spatial regression from an elevation perspective. Results Elevation class had significant effects on soil moisture content, soil pH, and soil available nitrogen content. The primary soil parameter affecting plant species composition and diversity in alpine grassland was soil available nitrogen content. The effect of soil available nitrogen content on plant species richness varied at different elevations. For Gramineae plants (G), plant species richness declined with the increase in soil available nitrogen content at low elevation, but rose at middle elevation. Soil available nitrogen content had a more significant limiting effect on species richness at high elevation. Conclusion Analyzing the relationship between plant species and soil physico-chemical properties increases our understanding of grassland degradation, and will improve grassland restoration programs and responses to climate change.

scholarly journals EFFECT OF FULZYME FERTILIZER, RICE RESIDUES AND DAP ON AVAILABLE OF SOME NUTRIENTS FOR THE SOIL OF BUDDED APRICOT SEEDLINGS PRUNUS ARMENIACA L. CV. "ZAGHINIA"

2020 ◽  
Keyword(s):  
Block Design ◽  
Organic Fertilizer ◽  
Prunus Armeniaca ◽  
College Of Agriculture ◽  
Available Nitrogen ◽  
Soil Available Nitrogen ◽  
Prunus Armeniaca L ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
Rice Residues

The study was conducted in the nursery of Hort. Dept., College of Agriculture and Forestry, Mosul University, Iraq, during 2018 season to study the response of budded "Zaghinia" apricot on seedlings rootstock to bio, organic and chemical fertilizers, and their effects on seedling growth. The studied factors were as follows: Bio fertilizer Fulzyme (0,1and 2 g. seedling-1 ), organic fertilizer (Rice residue) (0, 1 and 2 kg. seedling-1 ) and DAP fertilizers (0, 5 and 10 g. seedling-1 ). The study was performed by using split-split plots within factorial experiment in randomized complete block design (RCBD), with 3 factors and 3 replicates, by using 6 seedlings for each treatment. Treatment means were compared by using Duncan multiple levels at 5% p. the most important results obtained were as follows: 1 and 2 gm.seedling-1 of bio fertilizer (Fulzyme) and Chemical fertilizer (DAP) at the levels 5 and 10 g. seedling-1 affected significantly resulted in a significant increase in soil available nitrogen, while the addition of organic fertilizer (rice residues) and for both levels 1 and 2 kg. Seedling-1 gave a significant increase in nitrogen, phosphorus, ready-made potassium and pH of the seedling soil, and the bilateral interaction had a significant role in the growth of seedlings, especially the treatment of the interaction between the fertilizer (Fulzym) and organic fertilizer (Rice residues), which have a significant effect in giving the best results in available nitrogen, phosphorus and potassium in the soil, and the triple interference also gave a significant increase in all studied traits.

scholarly journals Organic fertilizer abrasive grits increase soil available nitrogen, plant height, and biomass

age ◽  
2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Michael Carlson ◽  
Frank Forcella ◽  
Sam Wortman ◽  
David Clay ◽  
Sharon A. Clay
Keyword(s):  
Plant Height ◽  
Organic Fertilizer ◽  
Available Nitrogen ◽  
Soil Available Nitrogen ◽  
Nitrogen Plant

The chemical composition of oats II. The nitrogen content of oats and groats

1955 ◽  
Vol 45 (4) ◽  
pp. 419-427 ◽  
Author(s):  
J. B. Hutchinson ◽  
H. F. Martin
Keyword(s):  
Grain Size ◽  
Nitrogen Content ◽  
Oil Content ◽  
Inverse Correlation ◽  
Early Summer ◽  
Available Nitrogen ◽  
Random Samples ◽  
Predominant Factor ◽  
Harvest Year ◽  
Kernel Content

The nitrogen content of oats depends chiefly on the nitrogen content (1·4–3·9%) of the kernel and the kernel content (64–81%) of the oats, the husk containing only 3–10% of the total nitrogen in the grain.Varietal differences are significant but small in comparison with the overall variability: they reach 0·3% nitrogen in a few cases. Variation between random samples is largely due to soil differences, with region and harvest year responsible for smaller effects. The predominant factor governing nitrogen level in oats of all varieties probably is, as for wheat, the level of available nitrogen in the soil in late spring and early summer, just prior to heading and during development of the grain.Within the variety there is a pronounced inverse correlation between nitrogen and oil content which is independent of grain size: the variability of the oil content within the variety is, however, smaller than the corresponding variability of the nitrogen content. At some localities environmental factors of soil and season, particularly the former, inhibit the filling out of the grains which then ripen prematurely to give small oats with lean kernels of high nitrogen content, and favour within the variety a negative correlation between grain size and nitrogen which otherwise might not be apparent.

Spatial assessment of soil nitrogen availability and varying effects of related main soil factors on soil available nitrogen

2016 ◽  
Vol 18 (11) ◽  
pp. 1449-1457
Author(s):  
Mingkai Qu ◽  
Weidong Li ◽  
Chuanrong Zhang ◽  
Biao Huang ◽  
Yongcun Zhao
Keyword(s):  
Spatial Distribution ◽  
Soil Nitrogen ◽  
Nitrogen Availability ◽  
High Availability ◽  
Soil Factors ◽  
Soil Nitrogen Availability ◽  
Available Nitrogen ◽  
Distribution Maps ◽  
Soil Available Nitrogen ◽  
Availability Ratio

Based on the spatial distribution maps of the soil AN and NAR, vulnerability areas with a low available concentration and low/high availability ratio of soil nitrogen were delineated based on different thresholds of the soil AN and NAR.

scholarly journals Distribution of Nutrients in Sundarbans Coastal Ecosystem- A Case study

Agropedology ◽  
2019 ◽  
Vol 27 (1) ◽  
Author(s):  
R. Srinivasan ◽  
◽  
D. C. Nayak ◽  
S. K. Singh ◽  
◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Nitrogen Content ◽  
Soil Management ◽  
Available Phosphorus ◽  
Organic Carbon Content ◽  
Available Nitrogen ◽  
Management Units ◽  
Very High

The distribution of nutrients were studied in six soil management units identified viz., Chandipur, Biprodaspur, Pathankhali, Manmathanagar-I, Manmathanagar-II and Bhupendranagar of Gosaba block (part) of sundarbans ecosystem. Data indicated that the soils were strongly acidic (< 4.5) to neutral in reaction and associated with marginal to severe salinity (> 13.3 dS m-1). The organic carbon content ranged from 0.67 to 1.66% in surface and 0.15 to 3.44% in sub-soils. The available nitrogen content varied from 90 to 502 kg ha-1 and it changed significantly with depth. The available phosphorus varied from 0.5 to 24.7 kg ha-1. Available potassium and sulphur in soils are very high, ranging from 178 to 572 kg ha-1 and 25 to 706 mg kg-1 respectively. DTPA -Fe and Mn varied from 18.9 to 336 and 2.17 to 37.6 mg kg-1 in soils being higher in sub-surface horizons, and DTPA- Zn and Cu ranged 0.27 to 4.73 and 0.63 to 14.5 mg kg-1 respectively.

INFLUENCE OF WEATHER CONDITIONS ON THE NITROGEN CONTENT OF WHEAT

1935 ◽  
Vol 12 (2) ◽  
pp. 228-237 ◽  
Author(s):  
J. W. Hopkins
Keyword(s):  
Nitrogen Content ◽  
Statistical Study ◽  
Weather Conditions ◽  
Growing Season ◽  
Significant Negative Correlation ◽  
Maximum Temperature ◽  
Vegetative Development ◽  
Total Leaf Area ◽  
Available Nitrogen ◽  
Main Effect

A statistical study of results from experimental plots of Marquis wheat grown annually (though not on the same soil) at five points in Saskatchewan and Alberta indicates that there was a significant negative correlation between the amount of rainfall during the growing season and the nitrogen content of wheat. The main effect of rainfall was exerted during May and June. The data do not justify the conclusion that the amount of rain falling in July or August, or the amount of pre-seasonal precipitation, modified the nitrogen content significantly. Mean maximum temperature for July or August failed to show a significant correlation with nitrogen content, but may not be a satisfactory measure of the temperature conditions actually experienced by the crop.It is suggested that the preponderating effect of early rainfall may be due to the fact that it stimulates tillering and vegetative development generally. The available nitrogen must thus be distributed amongst an increased number of culms, whilst at the same time the total leaf area devoted to the production of carbohydrates is augmented.

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