Effects of split nitrogen fertilization on post-anthesis photoassimilates, nitrogen use efficiency and grain yield in malting barley
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Effects of split nitrogen fertilization on post-anthesis photoassimilates, nitrogen use efficiency and grain yield in malting barley. / Cai, Jian; Jiang, Dong; Liu, Fulai; Dai, Tingbo; Cao, Weixing.
I: Acta Agriculturae Scandinavica. Section B. Soil and Plant Science, Bind 61, Nr. 5, 2011, s. 410-420.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Effects of split nitrogen fertilization on post-anthesis photoassimilates, nitrogen use efficiency and grain yield in malting barley
AU - Cai, Jian
AU - Jiang, Dong
AU - Liu, Fulai
AU - Dai, Tingbo
AU - Cao, Weixing
PY - 2011
Y1 - 2011
N2 - Split nitrogen applications are widely adopted to improve grain yield and enhance nitrogen use effective in crops. In a twoyear field experiment at two eco-sites, five fractions of topdressed nitrogen of 0%, 20%, 30%, 40% and 50% were implemented. Responses of radiation interception and leaf photosynthesis after anthesis, dry matter accumulation and assimilates remobilization, nitrogen use efficiency and grain yield to fraction of topdressed nitrogen treatments were investigated in malting barley. Net photosynthetic rate of the penultimate leaf, leaf area index and light extinction coefficient increased with increasing fraction topdressed nitrogen from 0% to 30%, and then decreased from 30% to 50%. The putative gross maximum canopy photosynthesis was the highest for fraction of topdressed nitrogen of 30%, which was concomitant with the highest amount of post-anthesis accumulated assimilates. The remobilization of pre-anthesis stored assimilates from vegetative organs into grains was hardly significantly affected by fractions of topdressed nitrogen. Grain yield was the highest for fraction of topdressed nitrogen of 30%, which coincided with the highest plant nitrogen uptake and physiological and agronomic nitrogen use efficiencies. The enhanced nitrogen use efficiency was corresponding to the improved photosynthetic nitrogen-use efficiency in the leaves at fraction of topdressed nitrogen of 30%. In conclusion, appropriate fraction of topdressed nitrogen application on malting barley improved assimilation rate and nitrogen use efficiency resulting in higher grain yields and proper grain protein content in malting barley.
AB - Split nitrogen applications are widely adopted to improve grain yield and enhance nitrogen use effective in crops. In a twoyear field experiment at two eco-sites, five fractions of topdressed nitrogen of 0%, 20%, 30%, 40% and 50% were implemented. Responses of radiation interception and leaf photosynthesis after anthesis, dry matter accumulation and assimilates remobilization, nitrogen use efficiency and grain yield to fraction of topdressed nitrogen treatments were investigated in malting barley. Net photosynthetic rate of the penultimate leaf, leaf area index and light extinction coefficient increased with increasing fraction topdressed nitrogen from 0% to 30%, and then decreased from 30% to 50%. The putative gross maximum canopy photosynthesis was the highest for fraction of topdressed nitrogen of 30%, which was concomitant with the highest amount of post-anthesis accumulated assimilates. The remobilization of pre-anthesis stored assimilates from vegetative organs into grains was hardly significantly affected by fractions of topdressed nitrogen. Grain yield was the highest for fraction of topdressed nitrogen of 30%, which coincided with the highest plant nitrogen uptake and physiological and agronomic nitrogen use efficiencies. The enhanced nitrogen use efficiency was corresponding to the improved photosynthetic nitrogen-use efficiency in the leaves at fraction of topdressed nitrogen of 30%. In conclusion, appropriate fraction of topdressed nitrogen application on malting barley improved assimilation rate and nitrogen use efficiency resulting in higher grain yields and proper grain protein content in malting barley.
KW - Former LIFE faculty
KW - grain yield
KW - malting barley
KW - photosynthesis
KW - photosynthetic nítrogen use efficiency
KW - split nitrogen fertilization
U2 - 10.1080/09064710.2010.497158
DO - 10.1080/09064710.2010.497158
M3 - Journal article
VL - 61
SP - 410
EP - 420
JO - Acta Agriculturae Scandinavica - Section B Soil and Plant Science
JF - Acta Agriculturae Scandinavica - Section B Soil and Plant Science
SN - 0906-4710
IS - 5
ER -
ID: 33747246