Results 11 to 20 of about 367,801 (311)

Quantitative Relationship of Plant Height and Leaf Area Index of Spring Maize under Different Water and Nitrogen Treatments Based on Effective Accumulated Temperature

open access: yesAgronomy
To optimize the growth management of spring maize, it is essential to understand the dynamics of plant height and leaf area index (LAI) under controlled water and nitrogen supply.
Tingrui Yang, Jinghua Zhao, Qiuping Fu
doaj   +3 more sources

Non-destructive assessment of plant nitrogen parameters using leaf chlorophyll measurements in rice

open access: yesFrontiers in Plant Science, 2016
Non-destructive assessment of plant nitrogen (N) status is essential for efficient crop production and N management in intensive rice (Oryza sativa L.) cropping systems.
Syed Tahir Ata-Ul-Karim   +5 more
doaj   +1 more source

The effect of mineral fertilizers on the yield of vegetable beans, depending on the competition between plants in crops [PDF]

open access: yesE3S Web of Conferences, 2021
The sources of nutrient accumulation in beans and bean seeds are the process of photosynthesis, root nutrition during the seed filling period, as well as the reutilization of substances accumulated in the vegetative organs in the previous period.
Varfolomeyeva Natalya   +3 more
doaj   +1 more source

Metabolic profiles of six African cultivars of cassava (Manihot esculenta Crantz) highlight bottlenecks of root yield [PDF]

open access: yes, 2020
Open Access Article; Published online: 17 Jan 2020Cassava is an important staple crop in sub‐Saharan Africa, due to its high productivity even on nutrient poor soils.
Fernie, A.R.   +14 more
core   +3 more sources

Do sandy beaches accumulate nitrogen?

open access: yesMarine Ecology Progress Series, 1986
A moderate-energy sandy beach receiving a hlgh natural organic load of stranded wrack was studied over 1 yr. Nitrogen input to the beach was calculated from wrack nitrogen content, an average standing stock of 72 kg m-' wet wrack and a turnover time of 9 d, estimated from litter bag (2mm mesh) experiments.
A MacLachlan, L McGwynne
openaire   +1 more source

Nitrogen management in wheat based on the normalized difference vegetation index (NDVI)

open access: yesCiência Rural, 2018
: Biomass production and nitrogen (N) accumulated in wheat shoots may be used for quantifying optimal topdressing nitrogen doses. The objective of this study was to develop and validate models for estimating the amount of biomass and nitrogen ...
André Luis Vian   +6 more
doaj   +1 more source

Red clover grown in a mixture with grasses: yield, persistence and dynamics of quality characteristics [PDF]

open access: yes, 2003
Red clover (Trifolium pratense L.) was grown in mixtures with timothy and meadow fescue in field experiments at four sites in Finland to broaden knowledge on its potential as a forage crop.
Mela, Timo
core   +2 more sources

Biological Nitrogen Fixation by Local and Improved Genotypes of Cowpea in Burkina Faso (West Africa): Total Nitrogen Accumulated can be used for Quick Estimation

open access: yesAdvances in Agriculture, 2018
Biological nitrogen fixation (BNF) by legumes is an indicator of their potential contribution to recycling nitrogen in cropping systems. Many techniques exist for the quantitative measurement of legume BNF. The isotopic dilution (ID) methods are the most
Boubié Vincent Bado   +3 more
doaj   +1 more source

Review of Influencing Factors and Quantitative Evaluation Methods of Legacy Effect in Nitrogen Pollution [PDF]

open access: yes长江科学院院报
[Objective] This study examines the legacy effect in aquatic nitrogen pollution control, emphasizing the role of historically accumulated nitrogen. It reviews advanced methods for quantifying lag times and legacy loads, aiming to provide a scientific ...
LI Shu-hao, LIU Zhi-hong, SONG Chang-chun
doaj   +1 more source

Biosolids affect the growth, nitrogen accumulation and nitrogen leaching of barley [PDF]

open access: yesPlant, Soil and Environment, 2018
Biosolids are organic fertilisers derived from treated and stabilised sewage sludge that increase soil fertility and supply nitrogen to crops over a long period, but can also increase the risk of nitrogen (N) leaching. In this work, spring barley was grown in lysimeters filled with soil amended with biosolids, and with and without mineral N ...
Iduna, Arduini   +2 more
openaire   +3 more sources

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