Effect of Soil Application of Zinc on Growth, Yield and Zinc Concentration in Rice Varieties

Abstract

Zinc (Zn) deficiency is widespread nutrient disorder in lowland rice growing areas in Asia, especially in Bangladesh. Intensive cropping with modern varieties causes depletion of inherent nutrient reserves in soils. The application of Zn fertilizers results in higher crop productivity and increases Zn concentration in crops. A field experiment was conducted to evaluate the effect of Zn application on growth, yield, and grain-Zn concentration in eight varieties of rice. The experiment was laid out in a split plot design with a distribution of Zn rates (0 kg ha-1 and 3 kg ha-1 from ZnO) to the main plots and rice varieties (BRRI dhan49, BRRI dhan52, BRRI dhan56, BRRI dhan57, Kalizira, Biroin, Gainja and Khirshapath) to the sub-plots. Zinc application improved effective tillers hill-1, grains panicle-1 and 1000-grain weight which impacted the grain yield of rice. Among the eight rice varieties, a significant increase of grain yield was recorded in BRRI dhan49, BRRI dhan52, BRRI dhan56 and BRRI dhan57 due to application of Zn. Zinc concentration of grain significantly increased in all rice varieties except Biroin. The highest grain-Zn concentration (19.1 mg kg-1) was noted in BRRI dhan57 with 3 kg ha-1 Zn and the lowest value (11.3 mg kg-1) was observed in BRRI dhan52 without Zn application. The highest percent increase of grain Zn concentration over control was obtained in high yielding rice variety BRRI dhan49 and the lowest Zn concentration was found in local rice variety Biroin.

Growth and yield performance of hybrid rice varieties under varying zinc levels

“…On the other hand, the shortest plant at 30, 60, 90 DAT and harvest (16.00,28.82,62.22 and 103.10 cm) respectively was observed in BRRI hybrid dhan5 along with no zinc application treatment combination (Table 1). This finding supported the claims made by Islam et al (2021) that there are considerable variations in plant height among cultivars and different doses of Zn.…”

“…Application of BRRI hybrid dhan5 along with 6 kg Zn ha -1 produced 48.13% higher grain yield over control treatment. The finding of the study was also in line with the findings of Islam et al (2021) and Zinzala and Narwade (2019).…”

“…Note: V 1 -BRRI hybrid dhan2, V 2 -BRRI hybrid dhan3 and V 3 -BRRI hybrid dhan5, Zn 0 -0 kg Zn ha -1 (control), Zn 1 -2 kg Zn ha -1 , Zn 2 -4 kg Zn ha -1 and Zn 3 -6 kg Zn ha -1 . The significant variation in effective tiller of rice with different varieties and level zinc was also reported by Islam et al (2021).…”

“…On the other hand, the minimum (21.49 g) result was obtained from BRRI hybrid dhan2 along with 0 kg Zn ha -1 . Proper Zn application rates and appropriate variety increase grain weight by allowing Zn to participate more efficiently in the various metabolic processes engaged in good seed production Islam et al (2021).…”

Effect of phosphorus and sulphur on productivity and profitability of blackgram (Vigna mungo L.)

“…The nutrient addition may have a synergistic or antagonistic effect on the availability of other nutrients. Generally, P and S interactions were found to be synergistic on dry matter yields of different crops at their lower levels of application, but at their higher levels of application, there was antagonistic interaction (Aulakh et al, 1990;Islam et al, 2006). Further, Jaggi (1998) observed the synergistic interaction between P and S at all levels of applied P (0 to 60 P 2 O 5 kg/ha) and S (0 to 90 kg S/ ha) on the seed and straw yield of Indian mustard.…”