Agronomic Bio-fortification of Zinc in Sorghum (Sorghum bicolor L.) Genotypes

摘要

A field experiment was conducted to assess the zinc (Zn) content in sorghum grain, leaves, stem and root with soil and foliar application of Zn. Significantly highest grain (3.25 t ha~(-1)), leaves (3.87 t ha~(-1)), stem (7.92 t ha~(-1)) and root (2.69 t ha~(-1)) yield was recorded with soil application of 5 kg Zn ha~(-1) through ZnS04 along with two foliar sprays @ 0.5% ZnS04 before flowering and at dough stage as compared to soil application of 5 kg Zn ha~(-1) alone or control. Among the eight sorghum genotypes, the genotype CSH-35 recorded significantly highest grain yield (3.99 t ha~(-1)) as compared to the PVK-809, CSV-20, AKSV-181, AKSV-161, AKSV-313, AKSV-314, AKSV-318 genotypes. Highest Zn content was recorded in sorghum grain (43.5 mg kg~(-1)), leaves (19.7 mg kg~(-1)), stem (23.6 mg kg~(-1)) and root (42.4 mg kg') consequent to soil application of 5 kg Zn ha~(-1)1 through ZnS0_4 along with two foliar sprays before flowering and at dough stage. Soil plus foliar application of Zn increasedthe Zn uptake by grain, leaves, stem and root of sorghum. The highest agronomic efficiency (AEZn) was recorded with the soil application of 5 kg Zn ha~(-1) through ZnS04, followed by soil application of 5 kg Zn ha~(-1)and two foliar application of ZnS04@ 0.5%, but the apparent recovery efficiency (REZn) of Zn was highest in the latter case. The RE_(Zn) increased with an increase in Zn levels, but AEZn decreased with the increase in Zn levels.