NUTRIENT UPTAKE, USE EFFICIENCY AND PRODUCTIVITY OF BROCCOLI (Brassica oleracea L. var. italica) AS INFLUENCED BY NPK UNDER DRIP AND CONVENTIONAL METHOD OF IRRIGATION
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Date
2023-08-01
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G.B. Pant University of Agriculture and Technology, Pantnagar-263145
Abstract
A field experiment was undertaken at Vegetable Research Centre of G.B. Pant
University of Agriculture and Technology, Pantnagar, Uttarakhand (India) during September to
February 2021-22 and 2022-23 to study the influence of NPK levels on growth, yield, quality,
nutrient content, nutrient uptake, nutrient and water use efficiency of broccoli (Brassica
oleracea L. var. italica) under drip and conventional irrigation system. The experiment was laid
out in two factorial randomized block design with three replication. The first factor comprises
of two methods of fertilization i.e., fertigation and conventional method whereas, second factor
being eight treatments having different NPK levels viz., T1 having recommended dose (RD) of
NPK, T2 having RD of N0PK (P and K only), T3 with RD of NP0K (N and K only), T4 having
RD of NPK0 (N and P only), T5 having RD of N0P0K (K only), T6 with RD of N0PK0 (P only),
T7 being RD of NP0K0 (N only) and T8 as control (N0P0K0).
The findings of present investigation revealed that performance of broccoli was
significantly influenced by drip fertigation and also by different levels of NPK application.
Based on pooled data, fertigation of broccoli at recommended dose of NPK was found best
with respect to growth parameters i.e., plant height (82.55 cm), number of leaves (34.33), head
weight (500.94 g) and total yield per hectare (163.12 qha-1) along with maximum TSS (12.29
ºB) and ascorbic acid (45.84 mg/100 g). The same treatment was also observed to be the best
with highest uptake of nitrogen (154.20 kg/ha), phosphorus (35.45 kg/ha) and potassium
(101.23 kg/ha). Similarly, recommended dose of NPK was also observed best in terms of
nitrogen use efficiency (62.73 kg/kg), phosphorus use efficiency (171.68 kg/kg) and potassium
use efficiency (125.05 kg/kg). Maximum water use efficiency (75.85 kg ha-1mm-1) and
profitability with a net return of `164571.40 and benefit-cost ratio of 3.57 was also recorded in
similar treatment. Hence, it is recommended for commercial cultivation of broccoli.
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