Plant growth parameters
In chickpea, lentil and lathyrus significantly taller plants were was recorded under M
3-
In-situ maize stalk mulch + Paddy straw (5 t/ha) as compared to M
0- No mulch (residue removal) and M
1-
In-situ maize stalk mulch (MSM) followed by M
4-
In-situ maize stalk mulch + Water hyacinth (2.5 t/ha) + Paddy straw (2.5 t/ha) and M2-
In-situ maize stalk mulch + Water hyacinth (5 t/ha). In chickpea, lentil and lathyrus significantly taller plants were recorded 32.09 cm, 29.75 cm and 31.83 cm respectively as in Table 1.
Significant results of mulching on plant height were found which might be due to higher moisture available in soil that leading to enhanced crop growth rate.
Liasu and Achakzai (2007) reported that mulching with
Tithnia diversiflia leaves and fertilizer application together promoted the growth (including plant height) and development and
Pervaiz et al., (2009) reported that plant height was higher due to mulch application.
Significant effect of mulches was recorded on biomass accumulation in all the crops in M
3-
In-situ maize stalk mulch + Paddy straw (5 t/ha) as compared to other mulches. The biomass accumulation was highest in mulching plots over control and highest biomass accumulation was recorded under M
3-
In-situ maize stalk mulch + Paddy straw (5 t/ha) in all the crops as in Table 2. This can be attributed to the improved water availability to the crop resulting from more efficient moisture conserving ability of the mulching compared to no mulch. Mulching enhanced soil moisture conservation and nitrogen addition from the mulched biomass might have improved nutrient supply, and thus resulted in better growth and dry matter production
(Sharma et al., 2010). This might be due to higher plant height and leaf area due to organic mulching supported by the findings of
Patil et al., (2011), Reddy et al., (2016). Mulching reduced the soil temperature at 0-10 cm of soil depth, it also reduces soil evaporation and increase dry matter accumulation during the growth stage reported by
Bu et al., (2013); Prasad et al., (2014); Marwein and Ray (2018). The availability of high soil moisture reduces stomatal closure; which induces the openings of the pathways for the exchange of water, carbon dioxide and oxygen, resulting in increases in photosynthetic rate and which ultimately add the dry matter production
(Madhu and Hatfield, 2014).
Yield parameters
In all the crops, significant influence of treatment on harvest index recorded due to mulches. Higher harvest index was obtained under M
3-
In-situ maize stalk mulch + Paddy straw (5 t/ha) as compared to M
0- No mulch (residue removal) and M
1-
In-situ maize stalk mulch (MSM) followed by M
4-
In-situ maize stalk mulch + Water hyacinth (2.5 t/ha) + Paddy straw (2.5 t/ha). The harvest index recorded under M
3-
In-situ maize stalk mulch + Paddy straw (5 t/ha) are 19.21%, 26.38% and 18.39% higher as compared to M
0- No mulch (residue removal) in chickpea, lentil and lathyrus respectively (Table 3). Similarly the highest seed yield was recorded from M3-
In-situ maize stalk mulch + Paddy straw (5 t/ha) in all the crops (yield) in chickpea, lentil and lathyrus are 1437 kg/ha, 975 kg/ha and 1526 kg/ha, respectively (Table 4). Higher seed yield might be due to combined use of maize stalk mulch and paddy straw/water hyacinth or combination of both that enhance the inherent moisture retention capacity as well as nutrient supplying capacity of the soil, which in turn improved seed yield. This could be due to addition of crop residue and subsequent decomposition released nutrient that helped in increasing the yield character of all the crops leading to their higher yield and better harvest index as compared to no mulch
(Liu et al., 2002; Karunakaran and Behera, 2013;
Reddy et al., 2016). Das et al., (2003) reported similar result in rice-wheat cropping system attributed to the ability of plant to absorb the adequate soil moisture and nutrients.
Significant effect of cropping systems and mulches was evident on maize equivalent yield (MEY) and system productivity. The highest MEY and system productivity was recorded in maize-chickpea cropping system (7566 kg/ha and 34.71 kg/ha/day) as compared to other two cropping systems (Table 5). There was 10.72% and 13.28% higher MEY and System productivity in maize-chickpea than maize- lathyrus cropping system. Higher MEY in maize-chickpea system was due to short duration (as compared to lentil and lathyrus), higher productivity (lentil) and higher market price of chickpea (Rs 46.2 per kg) and similar results were reported by Walia
et al. (2011) in maize-based cropping systems.
In case of mulches, significant highest MEY and System productivity was obtained under M
3-
In-situ maize stalk mulch + Paddy straw (5 t/ha) as compared to all other mulches. There were 25.44% and 25.32% higher MEY of System and System productivity recorded under M
3-
In-situ maize stalk mulch + Paddy straw (5 t/ha) as compared to M
0- No mulch (residue removal) (Table 5). Higher MEY and system productivity under these treatments were due to higher productivity of the crop
(Sharma et al., 2010).