Effect of phosphorus and sulphur application on phosphorus concentration (%) in seed and stover of black gram
It is observed that the application of phosphorus significantly increased the phosphorus concentration in seed and stover of black gram (Table 2). The maximum phosphorus concentration in seed (0.365 %) and stover (0.249 %) of black gram was obtained at phosphorus application 60 kg ha
–1. The higher values for phosphorus concentration at its higher doses were attributed to its increased availability to plants. Contrary to this, the application of sulphur had no significant effect on phosphorus concentration in seed and stover of black gram. The highest concentration of phosphorus in seed (0.376 %) and stover (0.266 %) of black gram was recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha
-1. The results obtained are in conformity with those of
Singh and Singh (2004) in black gram,
Yadav (2011) in cluster bean,
Teotia et al., (2000) and
Islam et al., (2006) in moong bean and
Deo and Khaldelwal (2009) in chickpea.
Effect of phosphorus and sulphur application on phosphorus uptake (kg ha-1) by seed and stover of black gram
The application of phosphorus significantly increased the phosphorus uptake by seed and stover of black gram (Table 3). The increase in phosphorus uptake in seed and stover with successive application of phosphorus 20, 40 and 60 kg ha
-1 over control was 58.02, 102.29 and 143.51 and 100.00, 185.90 and 251.28%, respectively. This high magnitude of increase in phosphorus uptake by seed and stover with the application of phosphorus might be due to higher availability of phosphorus, resulting in higher yield (Table 7) as well as higher concentration of phosphorus (Table 2) in black gram.
Further perusal of data presented in Table 3 reveals that the application of sulphur also significantly increased the phosphorus uptake in seed and stover of black gram. The increase in phosphorus uptake in seed and stover with successive application of sulphur 15 and 30 kg ha
-1 over control was 20.83 and 39.06 and 21.07 and 45.82%, respectively. This pattern of phosphorus uptake with different levels of sulphur might be due to the increased availability of phosphorus.
The maximum phosphorus uptake in seed (3.59 kg ha
-1) and stover (6.38 kg ha
-1) of black gram was recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha
-1, indicating synergistic effect of phosphorus and sulphur on each other as both the nutrients mutually help in their absorption and utilization probably due to balanced nutrition. Similar trends of phosphorus uptake were observed by
Singh et al., (2014) in mung bean and Yadav (2011) in cluster bean.
Effect of phosphorus and sulphur application on sulphur concentration (%) in seed and stover of black gram
The application of sulphur significantly increased the sulphur concentration in seed and stover of black gram (Table 4). increase in sulphur concentration in seed and stover with successive application of sulphur 15 and 30 kg ha
-1 over control was 12.23 and 19.12 and 8.04 and 12.50%, respectively. The higher values of sulphur concentration at its higher doses were attributed to its increased availability to plants.
The perusal of data in Table 4 further reveals that the application of phosphorus had no significant effect on sulphur concentration in seed and stover of black gram.
The maximum sulphur concentration in seed (0.397%) and stover (0.134%) of black gram was recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha
-1. The similar kind of results were obtained by Singh and Singh (2004) in black gram, Yadav (2011) in cluster bean,
Teotia et al., (2000) and
Islam et al., (2006) in moong bean and Deo and Khaldelwal (2009) in chickpea.
Effect of phosphorus and sulphur application on sulphur uptake (kg ha-1) by seed and stover of black gram
The data clearly indicate that the application of phosphorus significantly increased the sulphur uptake by seed and stover of black gram (Table 5). The data clearly indicate that the application of phosphorus 20, 40 and 60 kg ha
-1 significantly increased the sulphur uptake by seed (33.94, 63.03 and 99.39%) and stover (37.14, 65.71 and 100.71%) over control, respectively. The maximum sulphur uptake in seed and stover (3.29 and 2.81 kg ha-1) of black gram was obtained at phosphorus application 60 kg ha
-1. This pattern of sulphur uptake with different levels of phosphorus might be due to the trend observed in sulphur concentration (Table 4) and yield of black gram (Table 7).
Further, a perusal of data presented in Table 5 reveals that the application of sulphur significantly increased the sulphur uptake in seed and stover of black gram. The increase in sulphur uptake in seed and stover with successive application of sulphur 15 and 30 kg ha
-1 over control was 27.04 and 49.49, and 22.99 and 41.38%, respectively. The maximum sulphur uptake in seed and stover (2.93 and 2.46 kg ha
-1) of black gram was recorded at sulphur 30 kg ha
-1, respectively. This high magnitude of increase in sulphur uptake in seed and stover with the application of sulphur might be due to higher availability of sulphur, resulting in higher yield (Table 7) as well as higher concentration of sulphur (Table 4) in black gram.
A significant interaction was found between phosphorus and sulphur. The maximum sulphur uptake in seed (3.79 kg ha
-1) and stover (3.21 kg ha
-1) of black gram was recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha
-1, indicating synergistic effect of phosphorus and sulphur on each other since both the nutrients mutually help in their absorption and utilization probably due to balanced nutrition. The similar trend of sulphur uptake was observed by
Singh et al., (2014) in mung bean and Yadav (2011) in cluster bean.
Effect of phosphorus and sulphur application on plant height (cm)
Plant height of black gram significantly increased with successive application of phosphorus up to highest level of phosphorus 60 kg ha
-1 over control (Table 6). The % increase in mean plant height with the successive application of phosphorus 20, 40 and 60 kg ha
-1 over control was 29.82, 46.80 and 61.13, respectively. The maximum mean plant height of black gram that is 43.28 cm was obtained at phosphorus application 60 kg ha
-1. The very high magnitude of increase in plant height with the application of phosphorus might be attributed to the poor available phosphorus status of the experimental soil (Table 1) as well as the highly responsive nature of the black gram (cv. Uttara) to phosphorus application. Similar results were also reported by
Jat et al., (2012) in fenugreek that application of phosphorus significantly increased the plant height up to phosphorus 60 kg ha
-1. However, the present findings are in partially agreement with the result of
Bothe et al., (2000) who reported that the application of phosphorus @ 75 kg ha
-1 enhanced the plant height of soybean at highest value. Maurya and Rathi (2000) also found the positive effect of phosphorus on the plant height of soybean.
Further, the data on plant height (Table 6) revealed that the application of sulphur also significantly increased the plant height of black gram. The % increase in mean plant height with the successive application of sulphur 15 and 30 kg ha
-1 over control was 15.32 and 26.85, respectively. The maximum mean plant height of black gram (40.16 cm) was recorded at sulphur 30 kg ha
-1. This high magnitude of increase in plant height with the application of sulphur is also attributed to the low available sulphur status of the experimental soil (Table 1) and positive effects of sulphur on N-metabolism and consequently on the vegetative growth of black gram. However, the magnitude of increase in plant height with the application of sulphur was of lower order as compared to phosphorus application.
Akter et al., (2013) reported highest plant height of soybean at sulphur 40 kg ha
-1 which was statistically at par with that of sulphur 30 kg ha
-1. The results were also found in conformity with those reported by
Jat et al., (2012) that application of sulphur significantly increased the plant height of fenugreek up to sulphur 45 kg ha
-1. Similar findings were also reported in groundnut by Chaubey
et at., 2000 and in linseed by
Dubey et al., 1997.
A significant interaction was found between phosphorus and sulphur and the optimum plant height of black gram i.e. 45.85 cm was recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha
-1 clearly indicating synergistic effect of phosphorus and sulphur on each other as both the nutrients mutually help in their absorption and utilization by black gram probably due to balanced nutrition.
Tomar et al., (2004) also found the positive interaction effect of phosphorus and sulphur on the plant height of soybean. The highest plant height might have resulted from the synergistic effect of phosphorus and sulphur on the growth processes of the plant.
Effect of phosphorus and sulphur application on plant population (m-2)
The data presented in Table 6 clearly showed that the application of phosphorus slightly increased the plant population of black gram. The % increase in mean plant population with the successive application of phosphorus 20, 40 and 60 kg ha
-1 over control was 1.03, 3.19 and 4.50, respectively. The maximum mean plant population of black gram (29.50 m
-2) was obtained at phosphorus 60 kg ha
-1. Similarly the application of sulphur also slightly increased the plant population of black gram. The % increase in mean plant population with the successive application of sulphur 15 and 30 kg ha
-1 over control was 0.45 and 2.13, respectively. The maximum plant population of black gram (29.21 m
-2) was recorded at sulphur 30 kg ha
-1.
A non significant interaction was found between phosphorus and sulphur in black gram (cv. Uttara). However, the optimum plant population of black gram i.e. 30.35 m
-2 was recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha
-1. The probable reason of this slight increase is better root development as well as root proliferation and less mortality of black gram plant after germination. Several studies have shown the positive effect of phosphorus and sulphur application on root growth and morphology
(Hilal et al., 1990; Bagayoko et al., 2000). However, non significant interaction was found between phosphorus and sulphur on plant population in black gram (cv. Uttara).
Effect of phosphorus and sulphur application on number of pods plant-1
The data pertaining to the effect of different levels of phosphorus and sulphur application on number of pods plant
-1 of black gram have been presented in Table 6. A perusal of data revealed that the application of phosphorus significantly and markedly increased the number of pods plant
-1 of black gram. The % increase in mean number of pods plant
-1 with the successive application of phosphorus 20, 40 and 60 kg ha
-1 over control was 16.11, 22.67 and 32.43, respectively. The mean number of pods obtained varies from 18.75 in the treatment where no phosphorus was applied to 24.83 in the treatment where phosphorus 60 kg ha
-1 was applied. These findings are in agreement with
Akter et al., (2013) who reported that phosphorus application @ 30 kg ha
-1 increased the number of pods of soybean. Similar results were also found in soybean by
Reddy and Giri (1989), Jana
et at. (1990), and
Singh and Bajpai (1990). Similarly, the application of phosphorus also significantly increased the number of pods plant
-1 of black gram. The % increase in mean number of pods plant
-1 with the successive application of sulphur 15 and 30 kg ha
–1 over control was 7.20 and 12.95, respectively. The maximum mean number of pods plant
-1 of black gram (23.98) was recorded at 30 kg sulphur ha
-1 (Table 6).
Akter et al., (2013) also found that 40 kg sulphur ha
-1 resulted in production of highest number of pods plant
-1 (25.38) in soybean and the lowest number of pods plant
-1 (19.21) was recorded in no sulphur application. Moreover,
Sriramachandrasekharan and Muthukkaruppan (2004) made similar type of observations with the application of 30 kg sulphur ha
-1 in the presence of
Bradyrhizobium inoculation.
A significant interaction was found between phosphorus and sulphur on number of pods plant
-1 in black gram (cv. Uttara). The optimum number of pods plant
-1 of black gram i.e. 26.00 was recorded with combined application of phosphorus 60 kg ha
-1 and sulphur 30 kg ha
-1. The highest number of pods plant
-1 may be due to the fact that, the combined effect of both phosphorus and sulphur had positive effect on the reproductive growth and pod formation of black gram.
Akter et al., (2013) also reported significant combined effect of different doses of phosphorus and sulphur fertilizers on the number of pods plant
-1 in soybean. They recorded highest number of pods plant
-1 (30.73) with the combined application of phosphorus 30 kg ha
-1 and sulphur 40 kg ha
-1. On the other hand, the lowest number of pods plant
-1 (13.00) was recorded in the P0S0 treatment combination.
Majumdar et al., (2001) also found that combined application of phosphorus @ 60 kg ha
-1 and sulphur 40 kg ha
-1 respectively increased the number of pods plant
-1.
Effect of phosphorus and sulphur application on 100 seed weight (g)
The data presented in Table 7 indicated that the application of phosphorus significantly and markedly increased the 100 seed weight of black gram. The % increase in mean 100 seed weight with the successive application of phosphorus 20, 40 and 60 kg ha
-1 over control was 9.28, 17.72 and 27.00, respectively. The maximum mean 100 seed weight (g) of black gram (3.01) was obtained at phosphorus 60 kg ha
-1. The results confirms with the findings of
Akter et al., (2013) that application of phosphorus increased test weight in soybean with the highest test weight of 93.57 g with the application of phosphorus 30 kg ha
-1 which was statistically at par with the application of 50 phosphorus kg ha
-1. Similar findings were also reported by
Reddy and Giri (1989). Data further indicated that the application of sulphur also significantly increased the 100 seed weight of black gram with increasing levels of sulphur. The % increase in mean 100 seed weight with the successive application of sulphur 15 and 30 kg ha
-1 over control was 5.47 and 9.77, respectively. The maximum mean 100 seed weight of black gram (2.81 g) was recorded at sulphur 30 kg ha
-1. Again, the results obtained are in agreement with
Akter et al., (2013) that sulphur application increased test weight in soybean and the maximum test weight (92.78 g) was recorded with sulphur 40 kg application ha
–1. Moreover,
Hemantarajan and Trivedi (1997),
Agrawal and Mishra (1994) also reported that sulphur application increased test weight in soybean.
The interaction between phosphorus and sulphur in black gram was found statistically significant. The optimum 100 seed weight (g) of black gram i.e. 3.10 was recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha
-1. Application of nutrients particularly phosphorus and sulphur in right proportion might have lead to balance development of vegetative and reproductive structure which in turn resulted in formation of large size of seeds in black gram as reported by
Tomar et al., 2004, and
Majumdar et al., 2001.
Effect of phosphorus and sulphur application on seed and stover yield (kg ha-1)
The application of phosphorus significantly increased the seed and stover yield of black gram (Table 7). The increase in seed and stover yield with successive application of phosphorus 20, 40 and 60 kg ha
-1 over control was 27.55, 48.16 and 74.84% and 26.56, 47.55 and 72.45%, respectively. Similarly, the application of sulphur also significantly increased the seed and stover yield. The increase in seed and stover yield with successive application of sulphur 15 and 30 kg ha
-1 over control was 14.31 and 26.46% and 13.92 and 26.74%, respectively. The black gram response to phosphorus application was more as compared to sulphur application. Synergistic effect of phosphorus and sulphur on seed and stover yield was more in higher doses. The utmost seed (955.50 kg ha
-1) and stover (2398.30 kg ha
-1) yield of black gram was recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha
-1. The synergistic effect of phosphorus and sulphur might be due to the utilization of more quantity of nutrients through their well-developed root system and nodules, which might have resulted in better growth and yield. These results confirm the earlier findings of
Nagar et al., (1993) in soybean,
Sinha et al., (1995) in winter maize,
Choudhary and Das (1996) in black gram,
Shankaralingappa et al., (1999) in cowpea,
Randhawa and Arora (2000) in wheat,
Teotia et al., (2000) in moong bean,
Kumawat et al., (2004) in
taramira and
Islam et al., (2006) in rice.
Aulakh et al., (1990) and
Singh et al., (1995) have shown that the nature of phosphorus and sulphur interaction depends on their rates of application.