Growth and yield parameters
Results showed that the combination of raised bed + silver/black mulch+NAA application @ 15 ppm (T
3) performed significantly best for all the yield and its attributing traits over control treatment (T
12) (Table 1). 48.75% and 70.26% increment in plant height and number of branches per plant respectively was noted in P
1M
2N
1 as compared to control (P
2M
3N
2). Similarly, earliest flowering (26.89 days) was recorded by P
1M
2N
1 and late (36.60 days) flowering by P
2M
3N
2. Greater expand in fruit length (33.70%) and fruit width (35.12%) was recorded again in P
1M
2N
1as in comparison with P
2M
3N
2. Remarkable rise in fruit weight by 3.20%, 4.32%, 6.40%, 16.49%, 16.85%, 18.10%, 18.61%, 19.22%, 19.59%, 20.05% and 22.28% was estimated in T
6, T
11, T
5, T
8, T
10, T
2, T
4, T
1, T
7, T
9 and T
3, respectively as compared to T
12. Likewise, in case of number of fruits per plant was increased by 4.06%, 7.12%, 9.88%, 11.94%, 14.04%, 17.30%, 18.15%, 22.92%, 25.48%, 27.48% and 30.29% in T
6, T
11, T
5, T
8, T
10, T
2, T
4, T
1, T
7, T
9 and T
3, respectively as in comparison of T
12. Greater increase in yield per plant by 7.32%, 10.98%, 17.07%, 30.49%, 32.93%, 37.80%, 39.02%, 46.34, 50.00%, 51.22% and 58.54% was recorded in T
6, T
11, T
5, T
8, T
10, T
2, T
4, T
1, T
7, T
9 and T
3, respectively.
Yield per hectare was rise by 7.36%, 11.66%, 17.18%, 30.47%, 33.13%, 38.24%, 40.08%, 47.24%, 50.92% and 59.30% in T
6, T
11, T
5, T
8, T
10, T
2, T
4, T
1, T
7, T
9 and T
3, respectively (Table 1). Better plant growth and development in raised beds may be because of assimilation of macro and micro nutrients as well as more developed root system caused by tillage and greater nutrient availability (
Arvidson, 1999). The raised beds do not allow the soil to get compact and the plants are less damaged due to restricted cultural operations. This result in improved soil structure and control trafficking (
Berle and Westerfield, 2013). Mulching enhance greater plant morphology and yield due to no weed population, better soil moisture retention, optimum root zone temperature and better nutrient availability to the plants
(Verma et al., 2016, Edgar et al., 2016, Helaly et al., 2017). There was a linear increase in total yield with the application of NAA. The results obtained in the present findings may by explained on the basis that NAA treated plants remained physiologically more active to build up sufficient food material for developing more number of flowers and fruits, ultimately leading to more fruit setting and consequently more yield of better quality fruits (
Fatima and Denesh, 2014;
Vandana and Varma, 2014;
Kumari et al., 2017; Mohammad et al., 2017).
Weed count and weed control efficiency
As depicted in Table 1, P
1M
1N
1 (raised bed+ black polythene mulching+NAA application @ 15 ppm at 30 and 45 days after transplanting)proved to be more efficient for controlling weed population than P
2M
3N
2 (flat bed+no mulch+no NAA application)/control. Weed population was reduced by 77.80%, 76.58%, 72.72%, 72.55%, 68.66%, 68.22%, 67.15%, 66.37%, 12.69%, 5.23% and 2.31% in T
1, T
2, T
7, T
8, T
9, T
3, T
4, T
10, T
5, T
6 and T
11, respectively.
Similarly, the control treatment (T
12) has no efficiency to control weeds. Maximum (64.12%) efficiency to control weeds was recorded in T1 (raised bed+black polythene mulching+NAA application @ 15 ppm), while minimum (8.62%) was observed in T
11 (flat bed+no mulch+no NAA application) (Table 1). Number of weeds emerging out in one square meter area is an important factor which is directly related to plant vigor and yield of the plant. In the present study, mulching with black polythene and raised bed planting recorded minimum number of weeds and had greater intensity to control weeds which could be due to the fact that the mulch prevented the weed seeds to germinate. It might also be due to the preventive effect of mulch on light penetration that acted as physical barrier affecting the growth of most of the annual and perennial weeds
(Ram et al., 2005; Mukharjee et al., 2010; Asrafuzzaman et al., 2011). Another reason is mulch could be that it might create partially anaerobic conditions for the survival of weed species and thus finally resulting in a very low weed population, although moisture and nutrients were available (
Schonbeck and Tillage, 2011).
Economics of bell pepper production
The data pertaining to economics of different treatments have been depicted in Table 2. An examination of the data revealed that highest gross income per hectare amounting to Rs. 5,77,035.00/- was obtained in T
3 followed by Rs. 5,51,115.00/- in T
1 and Rs. 5,46,660.00/- in T
9), whereas, lowest
i.e. Rs. 3,62,220.00/- in T
12. On the other hand highest cost of cultivation per hectare
i.e. Rs. 2,24,618.07/- was obtained in T
3 followed by Rs. 2,22,928.07/- in T
4, whereas, lowest cost of cultivation (Rs. 1,47,874.66/-) was incurred in T
12.
Interestingly the treatment combination T
3 which yielded maximum (384.69 q/ha) also recorded maximum values of gross return (Rs. 5,77,035.00/-), net return Rs. 3,52,416.93/-but not B:C ratio (1:57) which was highest (1:74) in T
5. The reason for increased net profit in treatment T
3 may be due to maximum marketable yield, healthy and better fruit size and higher net returns as compared to other treatments which however, recorded more B:C ratio like T
5 (1:74) and T
11 (1:70) (Table 2). These results are in line with those of
Dadeech et al., (2018) who also recorded maximum net returns of Rs. 139,220.00/- with highest cost benefit ratio of 1:68:1 while using silver mulch in watermelon. The present results also showed that capsicum production in general is highly dependent on labour and can be described as labour intensive business venture.
Highest net returns of Rs. 3,52,416.93/- in T
3 in the present studies may be attributed to less expenditure on labour involved on weeding, hoeing and other cultural operations as mulch controlled maximum weeds. Similar results on the effect of mulching on seed production of bell pepper have also been shown by
Verma et al., (2014). Increased yield, net return and B:C ratio by using raised bed technology have also been shown by
Kumar et al., (2015) in garlic crop under irrigated condition of Uttar Pradesh.