NITROGEN MANAGEMENT IN TRANSPLANTED RAGI (Eleusine coracana (L) Gaertn)
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Date
2014
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
Abstract
A field experiment entitled “Nitrogen management in transplanted ragi” was conducted at Agricultural College Farm, Bapatla during rabi 2013-14.The experiment was laid out in a randomized block design and replicated thrice. The experiment consisted of nine treatments viz., Control (T1), 75% recommended dose of nitrogen (RDN) + 25% Nitrogen through farm yard manure (FYM) (T2), 50% recommended dose of nitrogen (RDN) + 50% Nitrogen through farm yard manure (FYM) (T3), 75% recommended dose of nitrogen (RDN) + 25% Nitrogen through vermicompost (T4), 50% recommended dose of nitrogen (RDN) + 50% Nitrogen through vermicompost (T5), 100% recommended dose of nitrogen (RDN) (T6), 75% recommended dose of nitrogen (RDN) + soil treatment (ST) with Azospirillum @ 5 kg ha-1 + 0.2% Zn spray at flowering (T7),100% recommended dose of nitrogen (RDN) + soil treatment (ST) with Azospirillum @ 5 kg ha-1 + 0.2% Zn spray at flowering (T8) and 125% recommended dose of nitrogen (RDN) + soil treatment (ST) with Azospirillum @ 5 kg ha-1 + 0.2% Zn spray at flowering (T9).
At all stages of observation, highest stature of growth parameters viz., plant height (cm), number of tillers m-2 and dry matter production (kg ha-1) were obtained with the application of 125% RDN + ST with Azospirillum @ 5 kg ha-1 + 0.2% Zn spray at flowering stage (T9), which was on a par with 75% RDN + 25% N through Vermicompost (T4).
Yield attributes of transplanted ragi viz., number of ear heads m-2, number of fingers earhead-1 and number of filled grains finger-1 were recorded higher with 75% RDN + 25% N through vermicompost (T4). Thousand grain weight was not influenced by different nitrogen management practices studied in this trial.
Significantly higher grain and straw yields were recorded with 75% RDN + 25% N through vermicompost (T4) and 125% RDN + ST with Azospirillum @ 5 kg ha-1 + 0.2% Zn spray at flowering stage (T9). The treatments, T8 and T6 were on par with T4.
With regard to nitrogen uptake by crop, it was recorded highest with 125% RDN + ST with Azospirillum @ 5 kg ha-1+ 0.2% Zn spray at flowering stage (T9) which was on a par with 75% RDN + 25% N through vermicompost (T4) and found significantly superior than other treatments.
With respect to quality of grain, high protein content of grain was recorded with vermicompost treatments (T5 and T4) while all the remaining treatments were on par with each other. The Zn content of grain was higher with 125% RDN, 100% RDN and 75% RDN in combination with ST with Azospirillum @ 5 kg ha-1 + 0.2% Zn spray at flowering stage (T9, T8 and T7 ) and remaining all were on par with each other.
Post harvest available N, P and K status in the soil was recorded higher with organic manure treatments (T3, T2, T4 and T5).
Higher net returns was recorded with 125 % RDN + ST with Azospirillum @ 5 kg ha-1 + 0.2% Zn spray at flowering stage (T9) while highest returns per rupee investment was recorded with 100% RDN (T6).
The lowest values for all the above parameters were recorded with control (T1).
From this study, it can be concluded that application of 100% recommended dose of nitrogen (50 kg N ha-1) in inorganic form was found to be optimum and economical for the production of white seeded ragi transplanted during rabi season and 25% of the nitrogen requirement of transplanted ragi can be substituted with vermicompost without any reduction in grain yield.
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