A pot experiment was conducted to study the effect of boron applied at four levels (viz., 0, 0.5, 1 and 2 kg B ha -1 ) and FYM applied at 0 and 5 t ha -1 on boron concentration as well as dry matter yield of paddy (var. CAU-R1) grown in an acid soil. Results revealed that irrespective of different levels of boron and FYM, there was an increasing trend of boron concentration and dry matter yield up to harvest. Significantly higher boron was accumulated in paddy grown in soil added with boron over control at different crop growth stages. Interaction of boron and FYM levels had no significant influence on boron concentration during the whole experiment. Application of boron @ 2 kg ha -1 and 5 tonnes ha -1 FYM in combination enhanced the boron concentration and dry matter yield at the latter growth stages of paddy. This shows more agronomic effectiveness of boron when applied in combination with FYM.
The critical limit of nitrogen in soil and plant (CAU R-1) was determined through a pot culture experiment with twenty five soils of Imphal West district of Manipur, India for predicting the response of rice to nitrogen application. All the soil samples were clayey in texture and acidic in reaction with the mean pH value of 5.16, electrical conductivity ranged from 0.06 to 0.14 dSm -1 with an average of 0.1 dSm -1 , organic carbon content from 1.06 to 2.62 % with mean value of 2.03%, cation exchange capacity of the soils from 12.20 to 20.20 meq/100g with mean value of 16.06 meq/100g. Available nitrogen content in soils varied from 185.00 to 331.06 kg N/ha with an average value of 267.24 kg N/ha. Available nitrogen in the soils was positively and significantly correlated with plant N content (r=0.653**), dry matter yield (r=0.556**), plant N uptake (r=0.726**) in control pots. There was also a positive and significant correlation between available N and bray's per cent yield (r = 0.519**). The critical limit of available N was established at 257 kg N/ha for soil and 1.04 % for 45 days old rice plants. Soil containing N below this critical limit may respond economically to N fertilization for growing rice.
A pot experiment was conducted during 2019 pre-kharif season in acid soil at College of Agriculture, Iroisemba, Cental Agricultural University, Imphal to investigate the effect of five levels of boron (viz., 0, 0.5, 1, 1.5 and 2 kg B ha -1 ) and two levels of lime (L1=unlimed and L2=limed) on boron concentration and dry matter yield of green gram (Vigna radiata L.) variety DGGS-4. Results revealed that irrespective of different treatments there was an increasing trend of plant boron concentration and dry matter yield up to harvest of the crop. Significantly higher boron concentration and dry matter yield were recorded in green gram grown in soil added with boron over control at different crop growth stages. Application of boron in absence of lime resulted in an increase in boron content of greengram. Irrespective of boron application, liming enhanced dry matter yield of the crop. The combined application of lime and boron at 2 kg ha -1 enhanced the dry matter yield of green gram followed by addition of lime and 1.5 kg B ha -1 at different growth stages. This shows higher agronomic efficiency of boron and lime.
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