Tailoring Soil Test Based Fertilizer Doses to Obtain Higher Wheat Yield
-
Author:V.B. Kuligod, M.B. Roodagi, G.B. Tuppad and M. Hebbara
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:99, Issue:oct-dec
DOI: https://doi.org/10.29321/MAJ.10.100177
Abstract
The wheat growing fields of north Karnataka were non-saline (ECe < 4 dSm -1 ) and pH of these
soils was buffered at 8.4. Most of the fields were low in organic carbon content. Among major
nutrients, Nitrogen was the most deficient with the average available nitrogen status of 148
kg ha -1 . The available phosphorus was rated as medium to high and available potassium was
very high. Among the micronutrients, Fe, Zn and Cu were deficient in the wheat soils whereas,
Mn available status was rated high. The grain yield remained significantly higher under STCR
fertilizer dose that had 190:89:91 kg ha-1 N, P2
O5 and K2 O, respectively compared to recommended
fertilizer dose (100:75:50 kg ha -1 N, P2 O 5 and K2 O, respectively) under LMH category of soil test
values. Under the LML category of the soil fertility status, STCR dose (178:100:135 kg ha -1 N,
P2
O5 and K2
O, respectively) registered the highest grain (29.2 q ha-1
) and straw yield (49.2 q ha-1
) of
the crop. This treatment was significantly higher compared to all other treatments except
the dose that was modified by -+ 25 per cent for nitrogen and potassium which were low in
soil (125:75:62 kg ha -1 N, P2
O 5 and K 2
O, respectively). Similarly, STCR (200:89:103 kg ha-1 N, P2
O 5
and K 2
O, respectively) and + 50 per cent modified fertilizer dose (150:56:25 kg ha -1 N, P 2 O5 and
K 2 O, respectively) recorded higher grain and straw yields compared to the RDF under LHH
category of soil nutrient status category. Fertilizer use efficiency remained the least and
significantly lower in STCR dose compared to all other soil test based doses.
Key words : Saline soil, wheat, soil test, yield.