JOURNAL OF RESEARCH IN AGRICULTURAL SCIENCE
Year:2006 | Volume:1 | Issue:2|Papers Count:14

In 400 Karaj’s seed and nunsery improvement and preparatory research station, qualitative land suitability evaluation has been investigated for irrigated wheat and barley, following the FAO framework for land suitability classification. For this evaluation, land characteristics has been compared with the crop requirements and based on the degree of matching, the classes have been determined. There are four recognized soil series in the research station namely, Haftjooy Farokhabad, Karaj and Shahrak, Haftjooy series showed the lowest suitabiliy classes among the four soil series, with soil depth and gravel contents as the main limiting factors. In Farokhabad series also the gravel content showed to be the main limiting factor. The other series showed to be highly to moderately suitable for irrigated wheat and barely (S1 and S2 classes). Parametric approach, using Storie and square root method for climatic and land index calculations, have been used in this study.

In order to increase water use efficiency for fruit and seed yield of three watermelon cultivars, a split plot design based on RCBD was conducted in Varamin research center during two years. Three irrigation period consisting of 6, 10 and 14 days as main factor and three watermelon cultivars: Charlestongrey, Yellow seed Mahboubi and Black seed Mahboubi were considered in sub-plots. The volume of irrigation water was measured with a 3 inches partial flume and adjusted for the same amount in each main plot. the parameters in this study were: fruit yield, seed yield, 1000 seed weight, dissolved solids in fruits, average fruit weight, total dissolved solids (TSS) in fruits and fruit skin thickness. the results showed that irrigation periods had a significant affect on fruit yield and average fruit weight and did not have any effect on other characters. The highest yield and average fruit weight obtained in 6 days irrigation period which means that with the irrigation period of 14 days and use of less water it would be possible to produce watermelon seed without any decrease in seed yield. The effect of cultivars was significant on all traits. The highest fruit and seed yield produced with yellow seeds mahboubi which was significantly superior to the two other cultivars. Cultivars and irrigation periods didn’t show any interaction with each other.

Water agriculture in green houses is now a days enjoying a significant status. This is due to the higher yield and higher qualities gained through relatively less costs. In the present research the growth index and yields of two cultivars (lettuce) were analyzed under the effect of two nutrient solutions. The factorial analysis (2x2) has been applied with completely random design on water culture (NFT) in the green house in Guilan University. The finding suggests that the effect of cultivar on total dry matter weight, unusable leaf number and the total plant weight was not meaningful. However the effect of cultivar on the amount of chlorophyll (p<1%) as well as on the number of usable leaves (p<5%) was meaningful. The effect of nutrient solutions on the total dry matter, amount of chlorophyll and the number of unusable leaves was not significant. This effect however was significant on the number of usable leaves (p<5%) and the total wet weight (p<1%). The interactive effect of cultivar and solution on the studied features was not significant. Finally we could conclude that the suggested solution had more effect on the growth parameter and the effect was more intensive on Rashel cultivar.

In order to evaluate the effect of different plant densities on yield and yield components in two grain Sorghum cultivars, this experiment was conducted, at the Research farm Azad-Islamic University of Khorasgan, located at Khatoon Abad village, Isfahan. The experimental design was a split plot in completely randomized block with four replications. Five plant densities (100, 150, 200, 250 and 300 thousand plants per hectar) and two cultivars (K1 and ICSV-89037) were considered as the main and subplots, respectively. The characters to evaluate in this experiment, include; grain yield, number of heads/m2, number of grains per head, 100 seed-weight, length of head, biological yield and harvest index. The effects of densities on the grain yield were statistically significant. Maximum grain yield was obtained at the highest plant density, but, it was not significantly different from the yield at density of 250 thousands plant/ha. Among the yield components, the number of heads/m2 were influenced by plant density. ICSV-89037 was significantly superior to the grain yield. Grain. Yield of ICSV-89037 with 14 percent humidity (14.5 t/h) was significantly grate than K1 cultivar (11 t/h). In this experiment, variation in grain yield was related to the number of heads/m2 and 100 seed-weight, respectively and number of heads/m2 explained 74% of this variability. According to the results obtained, the optimum plant density to achieve the maximum grain yield was 250 thousand plants/ha for K1 and ICSV-89037.

To evaluate drought stress effects on yield and its components of high yield rapeseed varieties in Isfahan region, reactions of three varieties of autumnal rapeseed to four irrigation regimes (stopping irrigation from flowering stage on, stopping irrigation from the podding stage on, stopping irrigation from grain filling stage on, and abnormal irrigation regime after 80 mm evaporation from class A evaporation tube) were studied. An arrangement of split plot in the form of randomized complete blocks design in 3 replications was carried out during cultivation season of 2003-2004.Results of this experiment showed that stopping irrigation (drought stress) from flowering stage on had deleterious effects on seed yield and its components, as it had meaningful reduction in the number of pods in plant (from 81.5 in evident treatment to 46.7 in stopping irrigation treatment from flowering stage on), the number of seeds in pod (from 23.3 in stage), weight of a thousand seeds (from 3.5 grams in evident treatment to 2.7 grams in stopping irrigation treatment from flowering stage on) and yield of seed (from 2730 kilograms in hectares in evident treatment to 2206 kilograms in hectares in stopping irrigation treatment from flowering stage on ), but in the meantime diversity in different levels of stress in comparison to diversity between evident treatment and stress treatment with regard to many characteristics was very trifle, so the results from this experiment demonstrated that rapeseed is a plant with low expectation and can have acceptable yield with the least available water but in case of enough irrigation it will have maximum production.

Fennel is one of the most important and oldest aromatic plants in Iran that belongs to Apiaceae family. It is used in medicinal industria. There is arid and semiarid regions in Iran that have saline water and soil and this is the main problem for cultivating. In order to evaluate the percentage and the rate of seed germination of fennel under saline condition, an experiment was conducted in 2002 in Esfahan. The experimental design was a completely randomized, with 4 replications and 7 treatments of saline water [EC= 0, 1, 3, 6, 9, 12, 15 dS/m]. Analysis variance showed that the treatments had significant effect (P£0.01) on the percentage and the rate of seed germination. Means comparison showed that based on mean percentage of germination, treatments were grouped in 4 classes. The highest and the lowest percentage of germination occurred in EC=1 and EC=15 dS/m with an average of %91 and %1 respectively. Based on the rate of germination, treatments were grouped in 5 classes. The control had the highest rate of germination by an average of 9.75 (seed germinated per day) and EC=15 dS/m the lowest rate of germination by an average of 0.05 (seed germinated per day).

This study was conducted to investigate the effects of water salinity and planting pattern on characteristics of forage corn (704) quality and quantity. The design was split plot with three replications during three years. The Main plot is irrigation water salinity with three levels, fresh water (W1), semi saline water (W2)and saline water (W3).the Sub plot is planting pattern with two level, planting in furrow (A1)and planting on the two side of furrow (A2). The results of the experiment showed that water salinity and planting pattern significantly affected on the dry of total yield, stem yield, leaf yield, cob yield, height of stem, stem diameter and protein yield. The interaction of saline water and planting pattern significantly affected on the total yield dry and its components and yield of protein. The results of Dancun test showed that maximum total dry yield was 7.5 T/ha in treatments of W1A2 and W2A2, maximum stem height and stem diameter were 105 and 1.9 cm and maximum of protein yield was 0.48 T/ha in treatments of W2A2. Finally water salinity with (EC=5.5 dS/m) and planting on the two sides of furrow best to compare with other treatments.