Chemical weed control in fodder sorghum (Sorghunt bicolor)
DOI:
https://doi.org/10.59797/ija.v38i1.3891Keywords:
Abstract
Of the many production constraints, constituting 94% of the total weed flora. presellce and coi~~petition from weeds seem Other weeds were latiithuria [Digera Mart.; syn., D. arvensis Forssk], to be of parmount importince in rainy- ntrrricata (L) seilson crops. Weeds culminate forage or nut grass (Cyperus rotlrndus L.) and inakra dry-matter yield reduction to an extent of [Dactyloctenium aegypticunz (L.) Willd.]. 1554% (Singh, 1988; Raghuvanshi el Visual toxicity of atrazine was significantly u1.,1990). Acceptabilily of atrazine by higher with higher doses on both the weeds. famier scan be more if its post-emergence Atrazine @ 0.25 or 0.5 kglha applied 7 or 14. -~- application is effective. days after sowing showed higher toxicity on i The field experi~nc~~t was conducted at both weeds than its pre-emergence and late Hisar during Ulc rainy seasons of 1990 and post-emergence (21 days after sowing) 1991 to study the chemical control of weeds application. 2, 4-D sodium salt @ 0.25 kg/ha in fodder sorghum [Sorglnrt~~. bicolor (L.) gave 80-95% control of carpet weed when Moench]. The field soil was sandy loam in applied 7-21 days after sowing, but failed to tcxture, medium in organic carbon. and control the barnyard grass. All the herbicide feitility: and was slightly alkaline in reaction treatments significantly reduced the total (PI-I 8.1). Sorghun~ JS 20 was sown on 26 weed weight compared with the unweeded July 1990 arid 5 June 1991. The 10 and 13 control. Atrazine @ 0.5 kg/l~a significantly weed-control treatments (Table 1) were reduced the weed weight than atrazine @ ...- replicated 3 times in randomized block 0.25 kg/ha at all h e stages of application design wid1 a plot size of 4.5 m x 3.15 m. except 21 days after sowing in both the Visual toxicity of weed-control treatments seasons. Average date of 2 seasoils revealed on weeds was recorded 45 days after sowing that atrazine application at 7 or 14 days after using a.scale of 0 to 100, where 0, 110control sowing proved either equally effective or and 100, complete control. The dry weight better in minimizing weed weight than its . of weeds was recorded 45 days after sowing early recommendation (as per-emergence). and fodder yield of crop at 70 days after The 2,4-D was only specifically effective on sowing. Fodder yield in 1990 could not be broad-leaf weeds. recorded due to heavy rains. Fodder yield of crop clearly revealed no - .- Major weeds of the experimental field toxicity on crop as well as superiority of wcre carpet weed (Trianthertta atrazine applicatio~~ on 7 and 14 days after porrl4luca,str~rt,1 L. and ban1 yardgrass sowing at both the rates compared with ils [Echitzochlau colotzr411~ (L). Link] pre-emergence or late pos t-emergence (21References
and 14 days after sowing. Post-emergence 2,
Raghuvanshi, R. K. S., Thakur, R. S., Unat, R. and
-Dapplication also gave better fodder yield
Nema, M. L.1990. Crop technology for optimum tban unweeded check and late atrazine grain production in sorghum-wheat sequence under -resource restraints. Indian Journal of
application. Higher and lower crop yields
lg mmmy 35 (3) :24b25f10 were owing to better and poor control of Sinah, 0.P.. Malik, H. P. S. and Ahmad, R. A.
dominant weeds. 1988. Effect of weed control treatments and nitrogen levels on the growth and yield of forage It that may be sorghum. Indian Journalo(Weed Science 20 (2) :
effectively used as post-emergence, i.e.7-14 29--34.
hldian I. Agron. 38 (1) :119-120 (March 1993)Role of bio-fertilizer in productivity of finger millet (Eleusinecoracana)
Main Sorghum Research Station, Gujarat Agricultural University, Surat 395 007
Received: October 1991
Finger millet [Eleusine coracana (L.) experiment was laid in randomized block Gaertn.] shows better adaptability under design with 10 treatments (Table 1) in 3 adverse environments (Seetharam and replications. The seedlings were raised in the Harinarayaia, 1986). The yield potentiality nursery and 25-day-old seedlings were can be increased up to 5,000 grain kgha transplanted 30 cm apart, keeping 7.5 cm with higher inputs of fertilizers and distance between plants within the row. The improved management practices. However, seedling roots were treated with different use of bio-fertilizers, especially concentrations of Azospirillurit at the time of Azospirilluat, reduces cost on fertilizers. transplanting. Half of the N fertilizer was Hence an experiment was conducted to study applied at the time of transplanting the effect of biofertilizer on productivity of and remaining half 1 month after finger millet. transplanting.
The experiment was conducted at waghai, All the treatments gave significantly to examine the response of finger millet to higher yield than the control except different levels during 1988--90. The treatment T, (Table 1). N @ 40 kgha (T,,)
