Abstract. Rustikawati, Suprijono E, Murcitro BG, Herison C, Sitohang SJ. 2022. Amendment of mycorrhizae and its residual effect on growth and yield of maize (Zea mays) hybrids in coastal land. Biodiversitas 23: 5600-5605. Maize (Zea mays L.) is known sensitive to less optimal environmental conditions. Maize cultivation in coastal land has low productivity due to the availability of low nutrients and the ability to hold groundwater. The addition of mycorrhizal fungi (MF) to the coastal land is expected to improve the root environment suitable for plants. This study aimed to evaluate growth and yield of maize hybrids grown in coastal areas amended with MF and examining its residual effect. The newly developed hybrids, CT34 and CT17, and a commercial check cultivar, BISI-18, were grown on a coastal land with the application of mycorrhizae at the rate of 0, 5, and 10 g.plant-1 in a factorial experiment with three replications. Observations were made on plant height, stem diameter, number of leaves, leaf length, leaf width, leaf greenness, root fresh weight, ear length, ear diameter, number of grain rows, number of grain.ear-1, and grain weight.plant-1. Data were analyzed for ANOVA, and the mean comparisons were conducted with DMRT at a=5%. The results showed that there was no interaction effect between the maize hybrids and the rate of mycorrhizae on any observed variables. The new hybrid of CT34 showed almost similar growth to that of the check cultivar, BISI 18, but the yield was significantly lower. CT34 showed better performance than CT17 on all variables. The application of MF significantly increased stem diameter and root fresh weight, which in turn increased maize yields in the coastal land. Increasing the mycorrhizal rate up to 10 g.plant-1 in coastal lands was ineffective in increasing maize productivity compared to 5 g.plant-1. In a bioassay study on the mycorrhizal residues in the second season, the treatment of 10 g.plant-1 significantly increased maize growth by more than 100% compared to without mycorrhizae.
Salinity stress is the major abiotic stress for crop production. The purpose of this study was to evaluate the effectiveness of zeolite on improving soil properties, the growth, and yield of Chinese cabbage. This pot experiment was conducted from September to November 2020 at the Research and Teaching Field of the Faculty of Agriculture, consisted of 6 treatment levels, i.e. (1) control, (2) soil + 6.9 g NaCl /10 kg soil, (3) soil + 6.9 g Na2SO4 /10 kg soil, (4) soil + 3.2 g zeolite /10 kg soil, (5) soil + 6.9 g NaCl /10 kg soil + 3.2 g zeolite /10 kg soil, and (6) soil + 6.9 g Na2SO4 /10 kg soil + 3.2 g zeolite /10 kg of soil, and arranged in a completely randomized design with 3 replications. The application of zeolite decreased the EC of salinized soil and increased the soil CEC. NaCl salinity stress reduced plant height (23%), number of leaves (22%), fresh weight of roots (165%), dry weight of roots (170%), stalk length (32%), and plant dry weight (131%), while Na2SO4 salinity stress only reduced the number of leaves (23%). The addition of zeolite to salinized NaCl soil increased stalk length (39%), plant fresh weight (172%), leaf fresh weight (174%), plant dry weight (133%), and leaf dry weight (23%), while to salinized Na2SO4 soil only increased plant dry weight (90%) and leaf dry weight (177%). The overall results show that the addition of zeolite can effectively ameliorate salinity stress due to NaCl.
The attack of Etiella zinckenella Treitschke on soybean varieties. Soybean is an important food and source of vegetable protein. One of the problems in soybean cultivation in Indonesia is the presence of pests. Integrated pest control (IPM) techniques are increasing along with the awareness of the importance of environmentally friendly sustainable agriculture. One component of IPM is the use of pest-resistant varieties. This study aimed to examine the effect of the soybean varieties against E. zinckenella Treitschke. This research was conducted with a factorial Randomized Completely Block Design (RCBD). The first factor was the type of organic fertilizer with a dose of 10 tons/ha: (P0= control, P1= Bokashi, P2= Vermikompos, P3=cow manure). The second factor is soybean varieties, which were: V1= Dena 2, V2= Dering 1, V3= Deja 2, V4= Deja 1, V5= Devon 1, V6= Devon 2, V7= Derap 1, V8= Derap 2, V9= Devatra 1, V10 = Devatra 2, V11= Detam 1, V12= Detam 2. The results showed that the interaction between varieties and organic fertilizer significantly affected the percentage of pod borer attack. The interaction between P1 x V8 varieties and between P2 x V6 varieties resulted in the highest percentage of pod borer attack and it was significantly different from other interactions, but not significantly different from P3 x V9, P3 x V5, P2 x V11, P1 x V6, P0 x V11, and P0 x V6.
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