Effect of sowing dates on different rapeseed varieties under rain fed condition

Rapeseed is a leading oilseed crop of Nepal occupying 85% of total oilseed cultivation area. This research was conducted to determine the response of different sowing dates on different rapeseed varieties in their final yield under the rain fed condition in Phulbari, Dang. Two rapeseed varieties Unnati and Surkhet Local on three dates of sowing Oct 4, Oct 24 and Nov 14 were tested under two factorial RCBD design in the year 2018 A.D. Data consisted growth attributes like plant height, branch per plant, no. of siliqua per plant, aborted siliqua and siliqua abortion percentage and yield attributes such as biological yield, biomass yield, seed yield, harvest index and test weight. Statistically no difference was found between varieties whereas differences were found on different sowing dates. Result showed that among the varieties, the highest yield (8.59 q/ha) was obtained in Surkhet Local than in Unnati (8.54 q/ha). In case of sowing dates, higher seed yield was obtained in Oct 4 sown crop (15.93 q/ha) followed by Oct 24 (7.47 q/ha) and Nov 14 (2.29 q/ha).The higher seed yield obtained in early sowing is due to shorter vegetative and longer reproductive phase. The comparison of mean values of the seed yield for interaction between variety and sowing date showed that variety Surkhet Local sown in Oct 4 plant had the highest seed yield (16.33 q/ha) followed by variety Unnati on same sowing date (15.54 q/ha). Based on the result obtained, Surkhet Local*Oct 4 performed better in Dang condition.

[1]  B. McConkey,et al.  Yield Adjustment by Canola Grown at Different Plant Populations under Semiarid Conditions , 2003 .

[2]  M. Stapper,et al.  Effects of sowing time and nitrogen fertiliser on canola and wheat, and nitrogen fertiliser on Indian mustard. I. Dry matter production, grain yield, and yield components , 2001 .

[3]  C. Singh,et al.  PERFORMANCE OF BRASSICA SPECIES UNDER DIFFERENT DATES OF SOWING IN MID-HILLS OF HIMACHAL PRADESH , 1998 .

[4]  M. Hasanuzzaman,et al.  Growth Dynamics of Rapeseed (Brassica campestris L.) CV. SAU Sarisha-1 as Influenced by Irrigation Levels and Row Spacings , 2008 .

[5]  G. Fathi,et al.  EFFECT OF SOWING DATE ON YIELD AND YIELD COMPONENTS OF THREE OILSEED RAPE VARIETIES , 2003 .

[6]  N. Mendham,et al.  Soil–plant–water relations of oilseed rape (Brassica napus and B. campestris) , 1991, The Journal of Agricultural Science.

[7]  Kb Basnet.  EFFECT OF DIFFERENT COMBINATIONS OF NUTRIENT SOURCES AND WEEDING PRACTICE ON THE PHYSIOLOGICAL CHARACTERS OF RAPESEED IN HUMID SUBTROPICAL CONDITION OF CHITWAN , 2005 .

[8]  J. Holland,et al.  Response of canola and Indian mustard to sowing date in the grain belt of north-eastern Australia , 2004 .

[9]  R. W. Daniels,et al.  Oilseed rape , 1984 .

[10]  P. Adhikari,et al.  Productivity of Maize Genotypes under Different Planting Dates , 2015 .

[11]  D. F. Cox,et al.  Statistical Procedures for Agricultural Research. , 1984 .

[12]  D. Whitfield.  Effects of temperature and ageing on CO2 exchange of pods of oilseed rape (Brassica napus) , 1992 .

[13]  A. Chaudhary,et al.  Effects of planting time on growth, development and productivity of maize (Zea mays L.) , 2018, Journal of Agriculture and Natural Resources.

[14]  N. Thurling.  Morphophysiological determinants of yield in rapeseed (Brassica campestris and Brassica napus). II.* Yield components , 1974 .

[15]  D. S. Bal,et al.  Influence of sowing dates, nitrogen and planting geometry on the performance of gobhi sarson (brassica napus ssp. oleifera var. annua) , 1998 .

[16]  S. Welham,et al.  Drought effects on yield and its components in Indian mustard (Brassica juncea L.) , 2007 .

[17]  Ram Bhandari.  Plant Oils in Nepal: A Potential Alternative Energy to Fossil Fuel , 2015 .

[18]  R. W. Daniels,et al.  The effect of varying seed rate on the yield and yield components of oil-seed rape (Brassica napus) , 1982, The Journal of Agricultural Science.

[19]  R. K. Scott,et al.  The limiting effect of plant size at inflorescence initiation on subsequent growth and yield of oilseed rape (Brassica napus) , 1975, The Journal of Agricultural Science.