Nutrient Management for Higher Productivity of Swarna Sub1 under Flash Floods Areas

Abstract

Two field experiments were conducted at Regional Agricultural Research Station, Tarahara, Nepal during 2012 and 2013 to determine the effect of agronomic management on growth and yield of Swarna Sub1 under flash floods. The first experiment was laid out in a split plot design with three replications; and four different nutrient combinations at nursery as main plots and three age groups of rice seedlings as sub plots. The second experiment was laid out in a randomized complete block design and replicated thrice; with three post flood nutrient doses at six and 12 days after de-submergence (dad). The experiments were complete submerged at 10 days after transplanting for 12 days. The survival percentage, at 21 dad, was significantly higher in plots planted with 35 (90.25%) and 40 (91.58%) days-old seedlings compared to 30 days-old seedlings (81.75%). Plots with 35 days-old seedlings produced 5.15 t ha -1 with advantage of 18.83% over 30 days-old seedlings. Plots with 100-50-50 kg N-P 2 O 5 -K 2 O/ha at nursery recorded the highest grain filling of 79.41% and grain yield of 5.068 t/ha with more benefit. Post flood application of 20-20 N-K 2 0kg/ha at 6 dad resulted in higher plant survival and taller plants, leading to significantly higher grain yield of 5.183 t/ha and straw yield of 5.315 t/ha. Hence, 35-40 days old seedlings raised with 100-50-50 kg N-P 2 O 5 -K 2 O /ha in nursery and the additional application of20-20 kg N-K 2 O /ha at 6 dad improved plant survival and enhanced yield of Swarna Sub1 under flash flood conditions. The practice has prospects of saving crop loss with getting rice yield above national average yield leading to enhanced food security in the flood prone areas of Nepal. ;f/f+ z crfgs af9L cfPsf] cj:yfdf jfnL Joj:yfkgaf6 :j0f{ ;a ! wfgsf] a[ l¢ / pTkfbsTjdf kg] { c;/x?sf] cWoog ug{ o; If] qLo s[ lif cg' ;Gwfg s] Gb| , t/x/f, ;' g;/Ldf ;g\ @)!@ / @)!# ;fndf @ j6f kl/If0f ;+ rfng ul/Psf] lyof] . klxnf] kl/If0f :KnL6 Kn6 l8hfOgdf tLg k6s bf] xf] of{ O{ , ;fy} d" Vo Kn6df g;{ /L Aof8df dnsf $ j6f ljleGg dfqfx? / ;a Kn6df # j6f pd] /sf j] gf{ /flv ;+ rfng ul/Psf] lyof] . bf] >f] kl/If0fnfO{ klg # k6s bf] xf] of{ O{ /] g8dfOH8 sDfKnL6 Ans l8hfOgdf ;+ rfng ul/Psf] lyof] . h;df # j6f ljleGg dnsf] dfqf kfgL x6fOPsf] ^ / !@ lbgkl5 xflnPsf] lyof] . oL b' j} kl/If0fx?nfO{ /f] kfO{ u/] sf] !) lbg kl5 !@ lbg;Dd kfgLdf 8' afOPsf] lyof] . pSt kl/If0fx?af6 kfgL x6fOPsf] @! lbg kl5 #% lbgsf] j] gf{ df ()=@%Ü / $) lbgsf] j] gf{ df (!=%*Ü jfRg ;Sg] Ifdtf k| ltzt kfOof] .;fy} #% lbgsf] j] gf{ sf] pTkfbsTj %=!% 6g÷x] S6/ cyf{ t !*=*#Ü n] #) lbgsf] j] gf{ eGbf a9L kfOof] . g;{ /L Aof8df gfO6« f] hg, km:kmf] /; / kf] 6fl;od dnsf] dfqf !))M%)M%) s] =hL÷x] S6/sf] b/n] ;a} eGbf a9L k' i6 bfgf k| ltzt -&(=$!Ü_ / pTkfbsTj -%=)^* 6g÷x] S6/_ lbPsf] kfOof] . bf] >f] kl/If0fdf