Abstract
Sewage sludge is considered as a valuable supplement because of its high organic matter, macro and micro nutrients. Its application has been studied in combination with recommended fertilizer dose (NPK is combination of N, P and K) for crops, viz. Kale and Spinach. The experiment comprised nine treatments (T1=0%SS+0%NPK as Control, T2=25%SS+0%NPK, T3=50%SS+0%NPK, T4=75%SS+0%NPK, T5=100%SS+0%NPK, T6=25%SS+75%NPK, T7=50%SS+50%NPK, T8=75%SS+25%NPK and T9=0%SS+100%NPK) which were laid in a completely randomized manner with triplicates. The study revealed that morphological characters, viz. root length per plant, shoot length per plant, root fresh and dry biomass, leaf area index and weight of edible part were significantly higher in T9 (0%SS+100%NPK) in both kale and spinach. Similarly, leaf area was significantly higher in T8 (75%SS+25% NPK) treatment in both kale and spinach. The various parameters related to plant quality like ascorbic acid, carbohydrate content and protein content were significantly higher with application of 75% Sewage sludge+25%NPK and hence improve growth, yield and quality of kale and spinach. Key words: Sewage sludge, NPK, growth, yield, quality, kale, spinach.
Highlights
The sewage sludge, known as bio-solids, is an obligatory by-product of wastewater recovered after its proper treatment (Singh and Agrawal, 2008; Khaliq et al, 2017)
The objective of the present work was to investigate the effect of different ranges of sewage sludge and recommended fertilizer doses (NPK) on (1) Growth, (2) Yield and (3) Quality parameters of kale and spinach
The present study revealed that root/shoot length, root fresh/dry biomass of the test crops, viz. kale and spinach, were significantly high with application of 100% NPK followed by application of 75% Sewage Sludge+25% NPK, whereas the values for theses parameters were significantly low in the plots which served as control (Tables 2 and 3)
Summary
The sewage sludge, known as bio-solids, is an obligatory by-product of wastewater recovered after its proper treatment (Singh and Agrawal, 2008; Khaliq et al, 2017). This trend is proving to be much problematic for both human health and environment. Sewage sludge, containing both inorganic and organic nutrients, is gaining importance for its use in agricultural management
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