DEPARTMENT OF CROP PHYSIOLOGY & ECOLOGY (CPE) http://103.7.193.12:8080/xmlui/handle/123456789/16 2026-07-26T08:19:13Z 2026-07-26T08:19:13Z BAGUM, SHAMIM ARA http://103.7.193.12:8080/xmlui/handle/123456789/2161 2026-06-16T09:29:35Z 2020-03-01T00:00:00Z

ASSESSMENT OF STATUS AND REQUIREMENTS OF NITROGEN AT DIFFERENT GROWTH PHASES OF WHEAT AND MAIZE THROUGH DIGITAL IMAGE ANALYSI BAGUM, SHAMIM ARA The study was conducted to assess the status and requirements of nitrogen at different growth phases of wheat and maize through digital image analysis. The major objectives were to study the effect of nitrogen on morpho-physiological traits; use digital image and software for assessment morpho-physiological traits at different growth stages and establish a relationship between morpho-physiological traits with image parameters. To fulfill the objectives four experiments were conducted in two successive years (2016-17 and 2017-18) at BARI, Gazipur, Bangladesh with wheat and maize crops. Wheat experiment comprised of four wheat varieties (BARI Gom 26, BARI Gom 28, BARI Gom 29 and BARI Gom 30) and four nitrogen levels (0.0 kg N ha-1, 50 kg N ha-1, 100 kg N ha-1, and 150 kg N ha-1) during 2016 17 and three wheat varieties (BARI Gom 26, BARI Gom 28 and BARI Gom 30) and five nitrogen levels (0.0 kg N ha-1, 60 kg N ha-1, 100 kg N ha-1, 120 kg N ha-1 and 140 kg N ha-1) during 2017-18. While, the maize experiment comprised of three maize varieties (hybrid 981, BARI Hybrid Maize 9 and hybrid P3396) and three nitrogen levels (100 kg N ha-1, 200 kg N ha 1and 300 kg N ha-1) in both the years. All the experiments were laid out in split plot design with three replications. Data on plant height (cm), Leaf Area Index (LAI), Canopy cover (CC), Soil-Plant Analyses Development (SPAD) reading of leaf, Leaf nitrate content (LNC), Leaf chlorophyll content (LCC), Normalized Difference Vegetation Index (NDVI), Total dry matter (TDM), different yield contributing and yield traits of wheat and maize. CC is an important phenotypic trait which indicates overall plant growth and helpful to predict advanced traits like biomass and yield. Digital image analysis was used as an alternative method to quantify the greenness of foliage as indirect measurements of crop N status and phenotyping. The image was taken from 50 cm above the plant canopy by using modified selfie stick. Two software’s (WCC for wheat and MCC for maize) were developed for digital phenotyping in JAVA and Interface design in JFrame. A five-step algorithm was developed to measure the CC of individual plots by RGB (red, green and blue). The output gave 27 digital traits value after analyzing an image including CC and NDVI. The values of canopy cover were closely correlated with the NDVI and the ratio vegetation index. Among the interaction treatments of wheat, maximum grain yield (3.97 t ha-1) was recorded by the interaction of 150 kg N ha-1 and BARI Gom 30 which was statistically similar to 100 kg N ha-1 and BARI Gom 29, 100 kg N ha-1 and BARI Gom 28 during 2016-17 where the maximum grain yield (3.94 t ha-1) was found with treatment combination 120 kg N ha-1and BARI Gom 26 which was statistically similar to 120 kg N ha-1 and BARI Gom 30, 120 kg N ha-1 and BARI Gom 28 during 2017-18. Among the interaction effect of maize variety and nitrogen level, highest grain yield (14.45 t ha-1) was recorded by the interaction of hybrid P3396 and 300 kg N ha-1 which was statistically identical with BHM 9 and 300 kg N ha-1). The results also indicated that, application of nitrogen fertilizer has positive effects on physiological parameters of wheat and hybrid maize. A strong relationship among the traits NDVI, SPAD, CC and LNC was observed across the wheat and maize varieties. The results also suggest that in case of NDVI, SPAD and CC saturation, NDVI and CC could accurately predict nitrogen requirements for wheat and maize. The results of this study partially supported the hypothesis that digital image traits measured by image processing software’s (WCC and MCC) can identify and differentiate variations in nitrogen use in wheat and maize crops. The outcomes of study have created a new era of using digital image analysis in the determination of N-requirement in wheat and maize in near future. ASSESSMENT OF STATUS AND REQUIREMENTS OF NITROGEN AT DIFFERENT GROWTH PHASES OF WHEAT AND MAIZE THROUGH DIGITAL IMAGE ANALYSIS; A Dissertation By SHAMIM ARA BAGUM, Registration No. 1605307, DEPARTMENT OF CROP PHYSIOLOGY AND ECOLOGY, HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY DINAJPUR-5200; March, 2020.

2020-03-01T00:00:00Z ISLAM, MD. HEDYATUL http://103.7.193.12:8080/xmlui/handle/123456789/2158 2026-06-15T08:13:18Z 2020-05-01T00:00:00Z

EFFECT OF IRRIGATION AND FOLIAR SPRAY OF POTASSIUM ON MORPHO-PHYSIOLOGY AND YIELD OF WHEAT ISLAM, MD. HEDYATUL The experiment was conducted at the Research Farm and Laboratory of Crop Physiology and Ecology Department, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh during 2015 - 2016 and 2016 - 2017 to study the effect of irrigation levels and yield of wheat and to find out morpho-physiological traits yield of wheat and to find out suitable concentration of potassium for foliar application in alleviating the adverse effect of drought on wheat. Four levels of irrigations (i) I0 - No irrigation (control), (ii) I1 - Irrigation with 3200 m3 ha-1 , (iii) I2 - Irrigation with 3800 m3 ha-1 and (iv) I3 - Irrigation with 4400 m3 ha-1 water and four levels of potassium such as (i) K0 - The recommended dose of potassium i.e. 50 kg K ha-1 in the form of KCl (control) (ii) K1-50% of the recommended dose of potassium i.e. 25 kg K ha-1 in the form of KCl + Foliar spray with 1% K2O using K2SO4 (iii) K2-50% of the recommended dose of potassium i.e. 25 kg K ha-1 in the form of KCl + Foliar spray with 2% K2O using K2SO4 and (iv) K3-50% of the recommended dose of potassium i.e. 25 kg K ha-1 in the form of KCl + Foliar spray with 3% K2O using K2SO4 were imposed as experimental treatments. Two wheat varieties, namely, BARI Gom 27 and BARI Gom 28 were tested for the above mentioned parameters. The experiment was laid out in a split-split plot design with 3 replications. Irrigation and potassium treatments had significant effects on all the above mentioned parameters in both the years. The plants irrigated with 4400 m3 ha-1 water needed the highest days for attaining their different phenological stages. The highest crop growth, morpho physiological traits, water consumption, chlorophyll content, yield contributing characters, potassium content of grain and straw and yield of wheat were exhibited in the crops irrigated with 3800 m3 ha-1 water in both the years. With some exceptions, varieties had no significant effects on all the above mentioned parameters in the study. Among the potassium treatments, the highest crop growth, morpho-physiological traits, yield contributing characters, potassium ontent of grain and straw and yield were recorded in treatment K2 (K2-50% of the recommended rate of K for the variety i.e. 25 kg K ha1 in the form of KCl + Foliar spray with 2% K2O using K2SO4) in both the years. Simple correlation coefficients between the yield contributing characters and grain yield for different irrigation and potassium treatments indicated that grain yield was positively correlated with most of the yield components. Wheat cultivation with 3800 m3 ha-1 water and potassium spray with 2% K2O using K2SO4 along with 50% of basal dose of K gave the highest crop growth, morpho-physiological traits, water consumption, yield contributing characters, grain and straw yield which was statistically similar with irrigations with 4400 m3 ha-1 water and potassium spray with 2% K2O using K2SO4 along with 50% of basal dose in both the years. EFFECT OF IRRIGATION AND FOLIAR SPRAY OF POTASSIUM ON MORPHO-PHYSIOLOGY AND YIELD OF WHEAT; A Dissertation By MD. HEDYATUL ISLAM, Student No. 1505162; DOCTOR OF PHILOSOPHY IN CROP PHYSIOLOGY AND ECOLOGY, DEPARTMENT OF CROP PHYSIOLOGY AND ECOLOGY, HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY DINAJPUR- 5200, BANGLADESH; MAY 2020.

2020-05-01T00:00:00Z HAQUE, MD. ZIAUL http://103.7.193.12:8080/xmlui/handle/123456789/2144 2026-05-14T06:30:40Z 2019-05-01T00:00:00Z

PHYSIOLOGICAL ATTRIBUTES AND YIELD OF WHEAT AS INFLUENCED BY IRRIGATION AND NITROGEN FERTILIZER APPLICATION HAQUE, MD. ZIAUL The experiment was conducted at the research farm and laboratory of Crop Physiology and Ecology Department, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh in 2014 - 2015 and 2015 - 2016 to study the morpho-physiological parameters, phenological stages, water relations, chlorophyll content, proline accumulation, nitrogen uptake, protein content, N use efficiency, yield and yield contributing characters of wheat. Benefit-cost ratio was calculated for cultivation of two varieties. Four levels of irrigations (i) I0- Rain-fed condition (control) (ii) I1- One irrigation (30 mm) (iii) I2- Two irrigations (30+30 =60 mm) and (iv) I3- Three irrigations (30+30+30 =90 mm) and four split application of nitrogen were (i) N0- control (no nitrogen) (ii) N1- total nitrogen at basal dose (iii) N2- one third of the N fertilizer was applied at basal dose, one third of the N fertilizer was applied at crown root initiation stage and the rest was applied at maximum tillering stage and (iv) N3- one fourth of the N fertilizer was applied at basal dose, one fourth of the N fertilizer was applied at crown root initiation stage, one forth was applied at maximum tillering stage and the rest was applied at heading stage. Two wheat varieties, namely, BARI Gom 24 and BARI Gom 26 were tested for the above mentioned parameters. The experiment was laid out in a split-split plot design with 3 replications. Irrigation and nitrogen treatments had significant effects on all above mentioned parameters in both the years. The plants grown in three irrigations (I3) condition needed the highest days for attaining their different phenological stages. Three irrigations exhibited the highest crop growth, morpho-physiological traits, water consumption, chlorophyll content, yield contributing characters, nitrogen uptake, grain and straw yield of wheat. With some exceptions, varieties had no significant effects on all the above mentioned parameters in this study. Among the nitrogen treatments, the highest crop growth, morpho-physiological traits, yield contributing characters, nitrogen uptake, protein content, N use efficiency, grain and straw yield were recorded in three split (N2) applications of nitrogen in both the years. Simple correlation coefficients between the yield contributing characters and grain yield for different irrigation and nitrogen treatments indicated that grain yield was positively correlated with yield components. In case of benefit-cost ratio, the highest benefit-cost ratio was found from BARI Gom 24 with three irrigations and three split applications of nitrogen. Wheat production with three irrigations gave the highest crop growth, morpho-physiological traits, water consumption, yield contributing characters, nitrogen uptake, grain and straw yield which were statistically similar with two irrigations. For the efficient use of nitrogen for wheat cultivation N fertilizer should be applied as three splits such as at basal, at CRI and during maximum tillering stages. PHYSIOLOGICAL ATTRIBUTES AND YIELD OF WHEAT AS INFLUENCED BY IRRIGATION AND NITROGEN FERTILIZER APPLICATION; A Dissertation By MD. ZIAUL HAQUE, Student No. 1405208; DOCTOR OF PHILOSOPHY IN CROP PHYSIOLOGY AND ECOLOGY, DEPARTMENT OF CROP PHYSIOLOGY AND ECOLOGY, HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY DINAJPUR- 5200, BANGLADESH; May 2019.

2019-05-01T00:00:00Z Akhter, Mst. Masuma http://103.7.193.12:8080/xmlui/handle/123456789/2141 2026-05-12T07:26:15Z 2019-02-01T00:00:00Z

EVALUATION OF WHEAT GENOTYPES FOR SUSTAINING YIELD UNDER WATER DEFICIT CONDITION Akhter, Mst. Masuma Drought is a worldwide problem, constraining wheat production seriously and recent global climate change has made this situation more staid. Selection of drought tolerant wheat genotypes as well as to development of proper crop management techniques is useful tools to enhance the drought tolerance. Regarding these issues, four experiments were conducted during 2014 to 2017 at Hajee Mohammad Danesh Science and Technology University and Bangladesh Wheat and Maize Research Institute (BWMRI), Dinajpur. Effect of PEG 6000 induced water stress (0, -2, -4 bars) on the germination and seedling growth of 30 wheat genotypes was evaluated in petri-dishes on September 2014. Wheat genotypes (BARI Gom 25, E 38, BAW 1118, E 18, Shatabdi, BAW 1138, E 34, E30, BAW 1135 and E 3) showing less affected speed of germination (rate of germination (%), co-efficient of germination and germination vigour index) and seedling growth (length and dry weights of shoot and root) along with higher STI (Stress tolerant index) based on seedling dry weight were considered as comparatively water deficit stress tolerant genotypes. The wheat genotypes (BAW 1151, E 42, BAW 1170, E 29, BAW 1161, E 2, BAW 1157, E 23, BAW 1130 and BARI Gom 26) showed reverse value of the aforesaid traits due to severe stress designating comparatively water deficit stress susceptible genotypes. To screen out more authentically based on yield traits and yield, all genotypes were grown in the field in 2014-15 under three water regimes viz. well watered (three irrigations), one irrigation and no irrigation condition. In no irrigated plots, wheat genotypes- BARI Gom 25, E 18, E 38, BAW 1118, BAW 1170, E 24, E 28, E 3, BAW 1171 and E 34 showed higher relative yield attributes and yield indicating tolerant, while BARI Gom 26, BAW 1130, BAW 1140, BARI Gom 27, BAW 1143, BARI Gom 28, BAW 1138, BAW 1157, E 23 and Sourav showed lower relative value signifying susceptible genotypes. Considering experiments I and II, four water deficit stress tolerant (BARI Gom 25, E 18, E 38 and BAW 1118) and two susceptible genotypes (BARI Gom 26 and BAW 1130) were evaluated physiologically in the third experiment. In view of chlorophyll content, SPAD value, water status (Relative water content, water retention capacity), canopy temperature depression, cell membrane stability (CMS), production of osmolytes (proline and soluble sugar), yield traits and yield, the genotype E 38 showed the highest stress tolerance and the genotype BAW 1130 showed the lowest stress tolerance. To ameliorate the adverse effect of drought stress, these two genotypes (E 38 and BAW 1130) were evaluated with five potassium fertilizer treatments in combination with water regimes during 2016-17. Additional soil and foliar application of potassium enhanced water stress tolerance in relation to LAI, LDW, TDW, water relation, nutrients (N, P, K) uptake, yield traits and yiled. However, considering the results of seed germination, seedling growth, physiology, yield traits and yield, the E 38 can be declared as a drought tolerant genotype, and addition of 75 kg K ha-1 may advised to apply for cultivation of wheat under rainfed condition in the drought prone area of Bangladesh. EVALUATION OF WHEAT GENOTYPES FOR SUSTAINING YIELD UNDER WATER DEFICIT CONDITION; A Dissertation By Mst. Masuma Akhter, Student No. 1405164; DOCTOR OF PHILOSOPHY IN CROP PHYSIOLOGY AND ECOLOGY, DEPARTMENT OF CROP PHYSIOLOGY AND ECOLOGY, HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY DINAJPUR, BANGLADESH; FEBRUARY 2019.

2019-02-01T00:00:00Z