EFFECT OF IRRIGATION AND NUTRIENT MANAGEMENT ON PRODUCTIVITY OF GOBHI SARSON (Brassica napus L.) UNDER CONSERVATION TILLAGE
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Date
2019-06
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CSKHPKV, Palampur
Abstract
The present study was conducted at experimental farm of CSK HPKV, Palampur, during
the year 2017-18 with the objectives to evaluating the effect of irrigation levels and nutrient
management on yield and nutrient uptake by gobhi sarson (Brassica napus L.) under
conservation tillage and to study the effect of various treatments on soil properties. Twelve
treatments comprised three irrigation levels viz., I1 (no irrigation), I2 (50% i.e. 25 mm
irrigation at critical stages) and I3 (100% i.e. 50 mm irrigation at critical stages) in main plots
and four nutrient management (NM) levels viz., NM1 (FYM @ 25 t ha-1), NM2 (FYM @ 20 t
ha-1 + 50%NPK), NM3 (FYM @ 10 t ha-1 + 75%NPK) and NM4 (100%NPK) in sub plots
were evaluated in a split plot design. Gobhi sarson (var. GSC-7) was sown on 24 November
2017. Irrigation with 25 mm water (I2) at 40 DAS (vegetative growth stage) and 130 DAS
(siliqua development stage) improved the plant height (cm) and no. of primary and secondary
branches, no. of siliquae per plant, no. of seeds per siliqua of crop and finally enhanced the
yield of crop significantly in comparison to rainfed conditions (I1). Further increase in
irrigation level to I3 at the respective irrigation stages, however, did not enhance the yield.
Among nutrient management practices significantly better growth and yield attributes were
observed under INM treatment involving NM3 which resulted in significantly highest seed
yield (13.50 q ha-1) followed by NM2 and NM4. The minimum growth and seed yield (10.27 q
ha-1) of crop was observed in the plots receiving 25 t ha-1 FYM only. Effects of irrigation and
nutrient management levels on 1000-seed weight and harvest index were not significant. The
uptake of different nutrients viz; N, P, K, S, Fe, Mn, Cu and Zn by gobhi sarson in general,
followed the yield trend. Crude protein content (15.63%) were higher under I3 level of
irrigation and NM3 level of nutrient management (15.38%). Soil pH and organic carbon at
surface (0-0.15 m) and sub-surface (0.15-0.30 m) layers were not affected by irrigation as
well as nutrient management levels. Water holding capacity and available N, P, K, S and
micronutrient cations (Fe, Mn, Cu and Zn) in soil increased significantly by integrated
nutrient management levels over sole chemical and organic application but irrigation levels
did not bring significant change in their contents. Total water use efficiency (TWUE) was not
affected by irrigation levels but nutrient management levels had significant influence on it.
Irrigation water use efficiency (IWUE) decreased with increase in irrigation levels, whereas
among nutrient management levels integrated plots increased it. The highest gross return (Rs.
66,063 ha-1) and net return (Rs. 33,407 ha-1) were obtained under combination I3NM3 whereas
highest B: C ratio obtained with combination of I2NM4 (2.47).