Real time nitrogen management for higher N use efficiency in transplanted rice (oryza sativa) under temperate kashmir conditions.
2009
Singh, D K | Singh, J K | Singh, Lal
A field experiments was conducted at Sher-e-Kashmir University of Agricultural Sciences and technology of Kashmir, Shalimar Campus, Srinagar during 2004- and 2005 to study the leaf colour chart 9LCC) based nitrogen management for increasing N use efficiency and reducing nitrate N leaching in transplanted rice temperate conditions of Kashmir. The experiment comprised 8 N management practices; control, use of threshold values of LCC 3 and LCC 5 and use of recommended N rate [120 kg/ha applied in 3 splits (50% as basal, 25% at active tillering and 25% at panicle initiation]were conducted in randomized block design with 3 replications. LCC 5 (180 kg N/ha applied in 6 splits) recorded significantly higher grain yields (6.61 and 6.70 tonnes/ha respectively in 2004 and 2005) without basal dose of nitrogen application (total of 100 kg N/ha), as compared to recommended dose of 120 kg N 4.86 and 4.81 tonnes/ha) and LCC 3 (60 and 90 kg N/ha). The LCC 3 (60 and 90 kg N/ha applied in 2 and 3 splits, respectively) was statistically at par with recommended dose of 120 kg N /ha in respect of yield and yield attributes. The nitrogen use efficiency and apparent recovery were significantly higher with LCC based N management than the recommended N management. Further higher agronomic efficiency (29.4 and 32.7 kg grain/ka N applied) apparent N recovery (52 and 57% respectively in 2004 and 2005) and returns/rupee investment in account of applied N (19.2 and 19.3/Re in the respective years) were recorded with LCC 5 where 20 kg N/ha was applied in 5 equal splits without basal application. Thus LCC threshed value 5 (100 kg N/ha) helped avoid over application of N to rice.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
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