Optimizing nitrogen-split application time to improve dry matter accumulation and yield in dry direct seeded rice

Low nitrogen use efficiency (NUE) is important yield limiting factor in rice. This study evaluated the response of split application time of N on total dry matter accumulation and yield in dry direct seeded rice (DSR). Total crop required N (143 kg per ha) was applied in different splits viz. three...

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Bibliographic Details
Published in:International journal of agriculture and biology 2013-01, Vol.15 (1), p.41-47
Main Authors: Hafeez-ur-Rehman (University of Agriculture, Faisalabad (Pakistan). Dept. of Crop Physiology), Basra, S.M.A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Crop Physiology), Wahid, A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Botany)
Format: Article
Language:English
Subjects:
BRANCHES
CROP YIELD
DIRECT SOWING
DRY MATTER CONTENT
GROWTH RATE
HARVEST INDEX
HEIGHT
INFLORESCENCES
LEAF AREA INDEX
NITROGEN FERTILIZERS
ORYZA SATIVA
PHOTOSYNTHESIS
SPIKELETS
SPIKES
SPLIT DRESSINGS
TILLERING
YIELD COMPONENTS
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Summary:Low nitrogen use efficiency (NUE) is important yield limiting factor in rice. This study evaluated the response of split application time of N on total dry matter accumulation and yield in dry direct seeded rice (DSR). Total crop required N (143 kg per ha) was applied in different splits viz. three splits with one-half at sowing, remaining half at tillering and anthesis; one-third each at sowing, tillering and anthesis; in two splits one-half each at sowing and tillering; sowing and anthesis; and at tillering and anthesis. Maximum pre-anthesis total dry matter (TDM), LAI, CGR and NAR were recorded for two N splits applied at sowing and anthesis followed by three splits each at sowing, tillering and anthesis. Application of two splits at sowing and anthesis also produced maximum total and panicle bearing tillers, kernels per panicle, 1000-kernel weight, straw and kernel yield, and harvest index following three equal splits. Response of panicle length and sterile splikelets to N splits was non-significant. Significant and positive relationship of TDM produced at anthesis with kernel yield and growth attributes was also found. In conclusion, two or three splits particularly with N supply at sowing and anthesis were better to improve crop growth, dry matter and yield in DSR and could be attributed to better nutrient uptake and reduced N losses increasing crop NUE.
ISSN:1560-8530
1814-9596