Effects of humic acids and micronutrients on sugarcane
1994
Ravikumar, C.M. | Govindasamy, R.
Effect of lignite-humic acids(HA) and micronutrients(Fe and Zn) were studied in sugarcane crop by a field experiments conducted between May 89 and April 90.The soil was sandy loam with pH 7.2 ECe 0.24 dSm-1, organic carbon 0.31% and low in availabe N,K,Fe and Zn.The experiment was laid out in RCBD with the following eight treatments replicated three times:Control(T1), HA 60 kg Ha-1(T2), Soil application (SA) of ZnSO4 25 kg ha-1 + foliar spray(FS) of 1% ZnSO4(T3), SA of FeSO4 50 kg ha-1 +FS of 2% FeSO4(T4),SA+FS of ZnSO4 and FeSO4(T8).HA as K-humate solution was sprayed on soil surface.Recommended doses of NPK were applied uniformly to all the plots.At maturity y, yield of cane and quality of cane juice were recorded.Leaf blades and shealths were analysed for mineral nutrients.Addition of HA in combination with SA and FS of ZnSO4 and FeSO4(T8) excelled all other treatments in influencing the yield attributes like tiller number, millable cane, number and length of internodes, girth of cane, single cane weight, length and weight of millable cane as well as cane yield and dry matter production (DMP). Addition of HA and micronutrients also improved the quality of cane juice as well as the mineral nutrients content of the leaf blades and sheaths of sugarcane.
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