Abstract
Organic fertilizer (OF) has positive effects on soil, especially soil fertility and productivity. Two experiments were conducted at the farmer’s field of Mymensingh and Jamalpur to observe the effect of organic fertilizer on cabbage production during rabi season 2018. There were seven fertilizer treatments viz: T1: RCF (N150 P40 K100 S16 Kg ha-1), T2: 85% RCF, T3: 70% RCF, T4: 85% RCF + 3 t ha-1 OF, T5: 85% RCF + 1 t ha-1 OF, T6: 70% RCF + 3 t ha-1 OF and T7: 70% RCF + 1 t ha-1 OF. The experiments were laid out in a RCBD (Randomized Complete Block Design) with three replications. The average fresh yield at Mymensingh ranged from 34.5 to 60.0 t ha-1 with the highest yield of 60.0 t ha-1 from treatment T4 (85% RCF + 3 t ha-1 OF). At Jamalpur, the average yield ranged from 31.5 to 56.3 t ha-1 and the highest yield of 56.3 t ha-1 was recorded from treatment T4 (85% RCF + 3 t ha-1 OF). The lowest yield was found from treatment T3 in both locations. The percent fresh yield increased over control (T1), was 42.85 and 40.04 in Mymensingh and Jamalpur, respectively. The highest gross margin is Tk. 534507, which was obtained from treatment T4 (85% RCF + 3 t ha-1 organic fertilizer). The highest MBCR 3.05 (average of two locations) was obtained from the same treatment T4 (85% RCF + 1 t ha-1 organic fertilizer). The result indicated that applying organic fertilizer and 85% recommended dose of chemical fertilizer is more profitable than applying chemical fertilizers only.
Highlights
The primary way of increasing the production of any crop depends on the soil conditions and improved production technology
All the organic fertilizer treated plots produced higher yield over chemical fertilizer treated plots except T7 (70% Recommended chemical fertilizer (RCF) +1 t ha-1 Organic fertilizer (OF)) because 1 ton organic fertilizer cannot recover nutrients that of 30% chemical fertilizer has been reduced in that treatment
From the different treatments of organic fertilizer with recommended chemical fertilizer packages, the results demonstrated that the highest cabbage yield was obtained from the treatment T4 (85% RCF + 3 t ha-1 OF)
Summary
The primary way of increasing the production of any crop depends on the soil conditions and improved production technology. Less use of organic matter, intensive cropping pattern, nutrient depletion of soil, imbalanced fertilizer application and improper management practices are the leading causes. Sustainable crop production can be achieved by integrated use of organic and chemical fertilizers. Karim et al (1994) stated that Bangladesh's soil organic matter depleted by 9 to 45% during the period from 1969 to 1990. The organic matter content and the nutrient status of Bangladesh soils are low and always declining day by day. The application of organic manure increases crop production significantly (Saleque et al, 2004). The importance of organic manuring for increasing soil productivity has been recognized early times. Incorporation of organic manure into soil has been shown to increase organic carbon, total nitrogen and crop yield (Chakraboty et al, 2001)
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