Development of prescription based fertilizer recommendation for okra
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Date
2022-12-19
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CSK HPKV, Palampur
Abstract
The present research study was conducted at the experimental farm of the Department of
Soil Science, Chaudhary Sarwan Kumar Himachal Pradesh Krishi Vishvavidyalaya, Palampur
(32˚ 6' N latitude and 76˚ 3’ E longitude) to determine the nutrients requirement, contribution of
nutrients from the soil, FYM and fertilizers in okra.
There were seventy two treatment combinations comprising of N, P, K and FYM. These
treatments were formed by different combinations as per the standard procedure of soil test crop
response correlation studies (STCR) and having four levels of N (0, 35, 70 and 105 kg N ha-1
), P
(0, 25, 50 and 75 kg P2O5 ha-1
) and K (0, 27.5, 55 and 82.5 kg K2O ha-1
) and three levels of FYM
(0, 10 and 20 t ha-1
). The soil of the experimental site was Typic Hapludalf, silty clay loam in
texture, acidic in reaction, low in available nitrogen (256 kg ha-1
), high in available phosphorus
(31.3 kg ha-1
) and medium in soil available potassium (190 kg ha-1
). The fruit and stover samples
taken at harvest of okra were processed and analyzed for determining the nutrients concentration
and nutrients uptake.
The results revealed that the okra fruit yield ranged from 52.7 to 132.6 q ha-1
in different
treatments. The total uptake of N, P and K in different treatments ranged from 28.3 to 94.7, 5.56 to
24.9 and 20.1 to 67.1 kg ha-1
, respectively. The amount of nutrients required to produce one
quintal of okra fruit was 0.67 kg nitrogen (N), 0.15 kg phosphorus (P) and 0.45 kg potassium (K).
Per cent contribution of nitrogen (N), phosphorus (P) and potassium (K) from soil was 14.88,
35.32 and 11.82, fertilizer 40.98, 20.95 and 63.56 and FYM was 6.93, 3.64 and 5.27, respectively.
Fertilizer adjustment equations developed with the help of basic data viz. nutrient requirement,
contribution of nutrients from soil, FYM and fertilizers are: FN= 1.64T – 0.36 SN – 0.17 ON, FP=
0.70 T – 1.69 SP – 0.17OP, FK= 0.71T – 0.19 SK - 0.08 OK. The ready reckoners for different
doses of N, P2O5 and K2O were also generated at different soil test values for different targets
yield of the okra.