Agronomic parameters of the two field pea variety with different tillage practices
Among the treatments, T3@ V
2W
1 (Prakash with zero tillage) takes least days (65) to reach 50% flowering and maximum days (129) to reach 80% maturity whereas T2@ V
1W
2 (Aman with conventional tillage) takes longest day (71) for 50% flowering and shortest days (122) to reach 80% maturity showing Prakash (V
2) shows early flowering but longer duration to mature (Table 3). The maximum field pea crop height was recorded in T1@ V
1W
1 (130.11) and lowest in T4@ V
2W
2 (88.83). The treatment T1@V
1W
1 shows maximum outcome in pod length (5.58 cm), number of pods per plant (15.38), number of seeds per pod (6.44), seed weight per plot (566 g) and seed yield per hectare (1597 kg/ha) and the observed record indicates that field pea variety Aman (V
1) is more suitable and efficient than Prakash (V
2) in Hengbung region (Table 3). Similar results are obtained from previous findings by
kumar et al., (2013), Das et al., (2014), Dixit et al., (2014), Praharaj (2015) and
Singh et al., (2018). The yield of the field pea V
1 and V
2 is higher in zero tillage system and similar findings is reported by
Brandt,1989,
Mahli and Nyborg, (1990);
McAndrew et al., 1994.,
Das et al., 2019.
Residual management of soil nutrient of field pea Aman (IPF-5-19) and Prakash (IPFD 1-10)
In Table 3, the data on nitrogen mineralization of field pea variety V
1 and V
2 with tillage method W
1 and W
2 showed that T1@V
1W
1 (162.65 kg/ha) showed release in higher amount of N, similar rfindings were observed and reported by
Zhou et al., (2020) and
Hariniharishma et al., (2025) and lowest is observed in T4@ V
2W
2 (150.52 kg/ha). The data for available P for field pea varieties V
1 and V
2 is given in Table 3. T1@ (V
1W
1) resulted in a highest P availability (16.81 kg/ha) among the four treatments. The lowest P availability among all other treatments was recorded in T4@ (V
2W
2) with Prakash variety (15.0 kg/ha). The highest K availability of 51.2 kg/ha is observed in T1@ (V
1W
1). Residual P released is more from organic P sources than inorganic sources
(Singh et al., 2012). Residual K availability increases the soil microbial activity which further enhance the release of K in the soil
(Bargali et al., 2024). Among all the treatments, T4@ (V
2W
2) resulted in lowest K availability of 35.24 kg/ha. The results clearly indicate that W1 for both field pea varieties in Hengbung consistently outperformed W
2 in terms of yield and residual nutrient availability. K is release in adequate with good nutrient management
(Saha et al., 2021). The yield increment in zero tillage is due to better moisture conservation and improved soil structure (
Bhatt and Khera, 2006,
Haque et al., 2022). This enhanced yield directly contributed to higher net income despite the slight increase in gross cost over the years. The overall findings suggest that zero tillage is a beneficial practice for enhancing the profitability of field pea varieties in RFS.
Interpretation of the residual impact of the two field pea varieties under different tillage practices
The variety, V1@Aman (IPF 5-19) shows higher nutrient release than V2@Prakash (IPFD- 1-10) and within the same variety, treatment under zero tillage showed higher released of soil nutrient N, P, K. Under zero tillage system (W
1), which is T
1 and T
3, the residual N availability of V
1 (T1@ 162.65 kg/ha) is higher than V
2 (T3@ 161.48) by 0.7% (Fig 2, Table 3), P availability by 50.5% (Fig 3) from T3@ 11.17 kg/ha to T1@ 16.81 kg/ha (Table 3) and K availability by 29.9% (Fig 4) from T3@ 39.42 kg/ha to 51.2 kg/ha (Table 3) showing that both V
1 and V
2 releases N in similar range but V
1 releases P and K way more efficient than V
2 but the release of P is to a much greater extend that zero tillage proves to release P efficiently with V
1. Under conventional tillage system (W
2) which is T
2 and T
4, the residual N in the soil is higher in V
1 than V
2 by 1.1% (T2@ 152.11 kg/ha, T4@ 150.52 kg/ha) which shows both variety releases N with minor difference and both field pea variety is a good source of N released in the soil. V
1 releases P and K to higher extend to V2 by 45.5% (T2@ 15.27 kg/ha, T4@ 10.49 kg/ha) and 42.1% (T2@ 50.08 kg/ha, T4@ 35.24 kg/ha) showing that under conventional tillage practices, the release of both P and K is in similar range. Within the same variety, from Table 3, both variety showed better release of nutrients in zero tillage. The N, P, K released for Aman (IPF 5-19) under T1@V
1W
1 (162.65 kg/ha) is higher than T2@V
1W
2 (152.11 kg/ha) by 6.9%, 10.1% (T1@ 16.81 kg/ha, T2@ 15.27 kg/ha) and 2.2% (T1@ 51.2 kg/ha, T2@ 50.08 kg/ha) and for Prakash (IPFD 1-10) N released under T3@V
2W
1 (161.48 kg/ha) is higher than T4@V
2W
2 (150.52 kg/ha) by 7.3%, , P released by 6.5% (T3@ 11.17 kg/ha, T4@ 10.49 kg/ha) and K released by 11.9% (T3@ 39.42 kg/ha, T4@ 35.24 kg/ha). The recorded data from the present study shows that both variety releases N with similar efficiency whereas V1 resulted in higher P release and V2 resulted in higher K release in the soil after harvest.
Economic analysis of field pea variety under zero and conventional tillage system
As per the data in Table 4, the variety Aman (IPF 5-19) showed an increase in yield by 5% from 1.56 t/ha under conventional tillage (T2) to 1.61 t/ha under zero tillage system (T1). The gross cost is more in T2 with total expenditure of Rs.48819.43/- and Rs.46823.95/- in T1. The net income for T1@ Rs.32953.24/-) is higher than T2@Rs.16600.57/- by 49.62%. The variety Prakash (IPFD 1-10) is recorded with an increase in yield by 9% from 1.22 t/ha under conventional tillage (T4) to 1.31 t/ha under zero tillage system (T3). The gross cost is more in T4@ Rs.47500/- and lesser in T3@Rs.43256/-. The net income for T3@ Rs.32060/- is higher than T4@ Rs.15321/- by 52.21%. The profit benefits the farmer by improving the economic stability and farmer’s income
(Nandan et al., 2018.,
Kumar et al., 2020.,
Kumar et al., 2025).