Abstract
Zero tillage straw retained with optimum K is an important strategy to increase cotton ( Gossypium hirsutum L.) yield and K efficiency in wheat ( Triticum aestivum L.)-cotton system. A 2 years field experiment was conducted during 2018, and 2019 to study the impact of [zero tillage straw as such on soil surface (ZT SAS ) and zero tillage straw burnt (ZT SB )] and five K rates were 0, 20, 40, 60 and 80 kg ha -1 on cotton yield and K use efficiency. Results indicated that bolls/plant –1 , weight per boll, seed cotton yields, ginning out turn and K agronomic efficiency were highest with 60-80 kg K ha –1 . Interactions revealed that ZT SAS with 60-80 kg K ha –1 had higher bolls/plant, bolls weight, seed cotton yields and ginning out turn compared to ZT SB . K agronomic efficiency indices decreased with increasing K rate. ZT SAS with 20 kg K ha –1 gave greater K agronomic efficiency than other combinations. ZT SAS with 60-80 kg potassium per hectare may be a sustainable and environmentally safe strategy to enhance cotton yield and soil fertility . Keywords: Zero tillage, residue management, potassium, cotton yield, K agronomic efficiency DOI: 10.7176/CPER/64-03 Publication date: January 31 st 2022
Highlights
Zero tillage plus straw retained as such on surface (ZTSAS) is a suitable tillage method that increased soil fertility and cotton production as compared to zero tillage straw burnt, ZTSB (Ishaq et al, 200; Hulugalle et al, 2004)
Plant height ANOVA indicated that plant height showed significant response to zero tillage plus residue management, potassium (K) it did not respond to ZT plus straw management (ZTSAS) × K interaction during b2018-19 (Table 3)
ZTSAS had the highest plant heightcompared to zero tillage straw burnt (ZTSB)
Summary
Zero tillage plus straw retained as such on surface (ZTSAS) is a suitable tillage method that increased soil fertility and cotton production as compared to zero tillage straw burnt, ZTSB (Ishaq et al, 200; Hulugalle et al, 2004). Zero tillage plus residues is the possible alternative to builds up organic matter in the surface of soil, increase moisture absorption capability, improve soil prosperities and increased cotton yield (Boquetet al., 2004). Cotton scientists said that ZT with residue mulch gave higher size of aggregates, stability and total organic carbon in soil aggregates than ZT straw burnt (Mert et al, 2006). Higher accumulation of organic matter in the soil, greater fertilizer use efficiency and optimum moisture accessibility increased cotton yield under zero tillage straw retained (Nyakatawa and Reddy, 2000;Blaise, 2011)
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