FORTIFICATION OF ZINC IN RICEGREENGRAM CROPPING SYSTEM

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Date
2016
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Acharya N.G. Ranga Agricultural University, Guntur
Abstract
A field experiment entitled “Fortification of zinc in rice-greengram cropping system” was conducted on clay loam soil of the Regional Agricultural Research Station, Anakapalle during kharif and rabi 2015-16 to study the effect of zinc on growth, yield, quality and economics of rice and rice fallow greengram cropping system. The experiment consisted of six main treatments in kharif rice viz., Control i.e., no zinc (M1), Soil application of 37.5 kg ZnSo4 ha-1 (M2), Soil application of 50 kg ZnSo4 ha-1 (M3), Soil application of 62.5 kg ZnSo4 ha-1 (M4), Soil application of 50 kg ZnSo4 ha-1 + 0.2% spray of ZnSo4 at panicle emergence (M5), Soil application of 50 kg ZnSo4 ha-1+0.2% spray of ZnSo4 at flowering (M6) and three subplots in rabi rice fallow greengram viz., Foliar application of 0.2% spray of ZnSo4 at 25 DAS (S1), Foliar application of 0.2% spray of ZnSo4 at flowering (S2), Foliar application of 0.2% spray of ZnSO4 at 25 DAS + 0.2% spray of ZnSO4 at flowering (S3) and replicated four times.The results were analysed in a Randomized Block Design for kharif rice and in Split Plot Design for rabi rice fallow greengram. The test varieties were MTU-1001 (Vijetha) for rice and LGG460 for greengram. Data collected on growth parameters viz., plant height, number of tillers m-2 and drymatter production of rice revealed that all the growth parameters were significantly highest with soil application of 50 kg ZnSO4 ha-1 + 0.2% spray of ZnSO4 at panicle emergence (M5) which was, however, comparable with M6, M4 and M3 treatments. M1 has recorded the lowest growth parameters and was comparable only with M2.Application of zinc at various levels could not significantly alter the panicle length but influenced the panicle weight which recorded significant differences. There was a significant improvement in the yield attributes (productive tillers m-2, total and filled grains panicle-1), grain and straw yield of rice with application of 50 kg ZnSO4 ha-1 + 0.2% spray of ZnSO4 at panicle emergence (M5), however, it was on a par with the treatments M6, M4 and M3. M1 has recorded the lowest of these parameters and was comparable only with M2.Highest zinc content in rice grain was found with M5 while for rice straw it was highest with application of 50 kg ZnSO4 ha-1 + 0.2% spray of ZnSO4 at flowering (M6). Growth parameters of rice fallow greengram (plant height, drymatter production and number of branches per plant) and yield parameters (number of pods per plant, number of seeds per pod, test weight) and yield (seed and haulm) of rice fallow greengram significantly did not differ among the mainplots except for plant height at 30 DAS. Among the subplots, all these parameters were the highest with foliar application of 0.2% spray of ZnSO4 at 25 DAS + 0.2% spray of ZnSO4 at flowering (S3) which was on a par with foliar application 0.2% spray of ZnSO4 at flowering (S2) and both of them were significantly superior over S1. Highest zinc content in greengram seed was found foliar application of 0.2% spray of ZnSO4 at 25 DAS + 0.2% spray of ZnSO4 at flowering (S3). Highest gross and net returns for rice was recorded with 50 kg ZnSO4 ha-1 + 0.2% spray of ZnSO4 at panicle emergence (M5) and least in M1 (Control-No zinc) and for rice fallow greengram with foliar application of 0.2% ZnSO4 at 25 DAS and flowering (S3)..The interaction effect between main plots and subplots were non-significant for all the observations taken for study. Hence it can be concluded that soil application of 50 kg ZnSO4 ha-1 + 0.2% spray of ZnSO4 at panicle emergence to rice and 0.2% ZnSO4 at 25 DAS and flowering to rice fallow greengram was found to improve the growth and yield besides being remunerative and fortifying the zinc content in seed and straw/haulm of rice greengram cropping system.
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D5225
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