Journal ID : AMA-13-03-2023-12121
[This article belongs to Volume - 54, Issue - 03]
Total View : 430

Title : Phenotypic stability of seed characteristics of fine grain Rice (Oryza sativa (L).) variety ADT53 is influenced by source-sink imbalances

Abstract :

Phenotypic stability by expression of varietal characteristics is highly influenced by nutrient imbalances caused by deficiencies of macro and micro nutrients. In Fine grain rice varieties, within one hill of the crop, tillers were showing morph types viz., long slender, bold type and tall tillers with elongated stems. Foliar sprays of macro and micro nutrients in seed production of short duration variety; ADT53 was formulated based on reduction in appearance of physiological off types, long slender, short bold and tall plant types. Soil application of NPK and Zinc, as per the recommended dosage (100:50:50 NPK, Zinc sulphate 25 kg/ha) showed 147 bold types (1.6%), 37 long slender grain types (0.4%), tall plant types 16 (0.2%) which were above the permissible levels. Four rounds of foliar applications to supplement the micro and macro nutrients on 15th, 25th, 45th, 60th DAP did not reduce the bold grain types (0.2%). Rescheduling of Nitrogen, Phosphorous and Potassium as 40: 0:75 kg/ ha combined with foliar sprays (15, 25, 45, 60th DAP) reduced the bold grain types to 0.06% by arresting tillers formation beyond active vegetative phase. The foliar spray treatments were repeated during Kharif-2022, and showed 0.05% and 0.04 % of off types (Long slender and bold) respectively. Processed seed yield increase was observed in the modified nutrients application procedure as 5641.7 kg/ha over the control 3966.7 kg/ha (42.2% seed yield increase). This report showed that balanced application of major and micro nutrients are essential for complete expression of varietal characteristics which are highly influenced by hidden hunger due to imbalances of nutrients viz., Nitrogen, Potassium, phosphorous, zinc and iron.

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