Modelling the effect of Different Mulches on Production of Chickpea Crops

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Date
2021
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MPUAT, Udaipur
Abstract
A field experiment entitled “Modelling the effect of different mulches on production of chickpea (Cicer arietinum L.) crop” was conducted during rabi season from 14th November, 2019 to 22th March, 2020 at technology park of CTAE Udaipur, (Rajasthan). Eight treatment combination viz. Irrigation based on field capability at three irrigation frequencies of I1-single irrigation (at presowing + flowering stage) and I2-double irrigation (at pre sowing + flowering stage + pod filling stage) along with mulch treatments i.e. M3-Bio degradable mulch (BDM), M2-Non-woven mulch (NWM), M1-Black poly mulch (BPM) and M0 -No mulch (NM) were laid out with three replications in factorial randomized block design (FRBD). The net water requirement of chickpea crop was found to be 70 mm at presowing only, 145 mm in single irrigation at presowing with flowering stage and 218 mm in double irrigation at presowing, flowering stage and pod filling stage. Mulching and irrigation frequencies significantly influenced the growth and yield parameters like maximum plant height (73.27 cm), number of primary branches/plant (30.20),number of pods/plant (138.13), average weight of pod (0.50 gm), number of seeds/pod (1.84), seed weight/pod (0.232 gm), yield/plant (31.83 gm), yield/plot (3.97 kg) and yield/hectare (26.49 q) at harvest. The maximum yield (26.49 q/ha) was recorded in treatment T7 i.e. combination of M3 (BDM) and I1 (single irrigation) Further maximum net income of Rs 44,089/ha with output: input ratio of 1.91 was also recorded under the same i.e. treatment (i.e. T7). However, the highest water use efficiency of 182.7 kg/ha-cm was recorded in treatment T7 i.e. combination of M3 (BDM) and I1(single irrigation). Calibration of AquaCrop model was done by using three parameters of T1 (100% ETc + no-mulch) treatment such as- canopy cover, biomass and yield. The results are supported by high value of Nash Sutcliffe Coefficient (R2 NS) as 0.908, 0.951 and 0.940 with Coefficient of Residual Mass (CRM) having value as -0.1001, -0.160 and -0.210 for canopy cover, biomass and yield respectively, which indicates that model overestimates the canopy cover, biomass and yield. AquaCrop model was validated using biomass and yield data of T2 to T8 treatments. During validation R2 NS values for biomass and yield were found as 0.918 and 0.923 respectively. Also, CRM values for biomass and yield were found as -0.205 and -0.206 respectively, which concluded that model overestimates the biomass and yield. This result indicates that on average BD, NW and BP mulch treatments increased water use efficiency (WUE) with respect to no-mulch treatments. This clearly shows that single irrigation with BD mulch treatments are better for WUE under these conditions which also justifies the significant effect of mulch treatments in moisture conservation as compared to no mulch treatment.
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Modelling the effect of Different Mulches on Production of Chickpea Crops
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Citation
Garhwal J.M. and Bhakar S.R.
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