Determination of nutrient requirement, contributions from soil and fertilizers for evolving integrated fertilizer prescription equations in pea in an acid Alfisol
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Date
2022-01-31
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Palampur
Abstract
The present investigation was conducted at the Experimental Farm of the Department of
Soil Science, Chaudhary Sarwan Kumar Himachal Pradesh Krishi Vishvavidyalaya, Palampur.
The soil of the experimental site was Typic Hapludalf, silty clay loam in texture, acidic in
reaction, low in available nitrogen (N), high in available phosphorus (P) and medium in available
potassium (K) at the initiation of the experiment. The experiment was conducted as per the
technical programme and methodology of AICRP on Soil Test Crop Response. The experiment
was conducted in two phases. In first phase soil fertility gradient was developed by dividing
experimental field into three equal strips and applying graded doses of fertilizers in these strips
and growing of exhaust crop fodder Maize. In the second phase i.e. next season test crop pea (var.
Palam triloki) was grown by dividing each strip into 24 plots having 21 treated and 3 controlled.
Response to selected combinations of three levels of FYM (0, 10 and 20 t/ha), four levels of N (0,
27.5, 55 and 82.5 kg N ha-1
, four levels of P (0, 35, 70 and 105 kg P2O5 ha-1
) and four levels of K
(0, 25, 50 and 75 kg K2O ha-1
) at different fertility levels of pea was studied. The values of the
Alkaline KMnO4 extractable N ranged from 195 to 267 kg ha-1
, Olsen’s P ranged from 9.9 to 35.2
kg ha-1
and neutral normal NH4OAc extractable K ranged from 141 to 210 kg ha-1
in the
experimental field. The total uptake of N, P and K by pea ranged from 57.4 to 203.7, 2.64 to 14.1
and 30.5 to 130.7 kg ha-1
, respectively. In the present investigation the fresh grain yield ranged
from 53.3 to 206.6 q ha-1
and dry matter yield of grain ranged from 13.25 to 51.35 q ha-1
. The
nutrient requirement for production of one quintal of grain yield of pea was found to be 1.08 kg
N, 0.06 kg P and 0.63 kg K. Percent contribution of nitrogen, phosphorus and potassium was 33.3,
20.1 and 24.4 from soil, whereas from FYM was 12.2, 4.93 and 19.2 percent. Contribution from
fertilizer as a percentage was 64.2, 9.67 and 73.4, using with FYM for nitrogen, phosphorus and
potassium, respectively. Fertilizer adjustment equations developed for conjoint use of fertilizers
with the help of basic data are: FN= 3.44 T - 1.06 SN - 0.38 ON, FP= 1.56 T - 5.36 SP - 1.22 OP,
FK= 1.72 T - 0.67 SK - 0.49 OK.