Effect of Mulching on Growth and Yield of Peanut (Arachis hypogaea L.) on the Coastal Sandy Land in Nghe An Province, Vietnam

Background: Peanut (Arachis hypogaea L.) is one of the oil and cash crops in Vietnam. However, owing to the lack of appropriate management practices, the production and the area under cultivation of peanut have remained low. Mulches are the key factors contributing to promoting crop development and early harvest and increasing yields. Methods: The experiment consisted of three mulch treatments, viz., plastic mulch, straw mulch and no-mulch control. All the treatments were replicated thrice in a complete randomized block design. Result: In the conditions of mulch, the plant growth parameters (germination rate, growing time, plant height, number of branches per plant), leaf area index, the number of nodules per plant, dry matter accumulation, yield components and yield of peanut was much higher than that of no-mulch control. Among the mulches, plastic mulch was found superior to straw mulch in the pod yields and water-use efficiency and moisture conservation, thereby can be considered as a reliable practice for increasing the productivity of peanut on the coastal sandy land in Nghe An province, Vietnam.

Saponins accumulation and antimicrobial activities on shallot (Allium cepa L.) from marginal land

Saponins are one of the secondary metabolites found in Shallot (Allium cepa L.), particularly in the roots. Microclimate differences in the cultivation area are thought to have a significant impact on the production of secondary metabolites, such as saponins. This research aimed to observe the saponins content in the root of shallot plants cultivated in marginal agricultural land and their antimicrobial activity against bacteria (Ralstonia solanacearum) and fungus (Fusarium oxysporum). This research was observational research with a random sampling method. The samples were collected from the shallot plantation with two different cultivation conditions. Two varieties of ‘Bima' and 'Tiron' cultivated by farmers in sandy coastal land Samas, Bantul were used. The plants were harvested at 1, 1.5, and 2 months after planting, respectively. The crude saponins extract was used to test antimicrobial activity. Shallot plants cultivated in marginal coastal sandy land produced higher saponins accumulated in their roots. The saponins production increased along with the maturity of shallot plants, both cultivated in marginal coastal sandy land and regular paddy field. The saponins extracted from the roots of shallots cultivated in both marginal and regular land showed higher antimicrobial activity than antifungal activity. Saponin merupakan salah satu metabolit sekunder yang terdapat pada bawang merah (Allium cepa L.), terutama pada bagian akar. Perbedaan iklim mikro pada lahan budidaya diduga akan berpengaruh terhadap produksi metabolit sekunder termasuk saponin. Tujuan penelitian ini adalah untuk mengetahui kandungan saponin pada bagian akar tanaman bawang merah yang dibudidayakan di lahan pertanian marginal serta aktivitas antimikrobanya terhadap bakteri (Ralstonia solanacearum) dan jamur (Fusarium oxysporum). Penelitian ini merupakan penelitian observasi dengan metode pengambilan sampel secara acak. Sampel berasal dari perkebunan bawang merah dengan dua lahan budidaya yang berbeda. Digunakan dua varietas yaitu 'Bima' dan 'Tiron' yang dibudidayakan oleh petani di daerah pantai Samas,kabupaten Bantul. Bahan tanaman dipanen pada tiga waktu berbeda, yaitu 1 bulan, 1,5 bulan dan 2 bulan berturut-turut setelah tanam. Ekstrak kasar saponin digunakan untuk menguji aktivitas antimikrobanya. Tanaman bawang merah yang dibudidayakan di lahan marginal pasir pantai menghasilkan saponin yang lebih tinggi yang terakumulasi pada akarnya. Produksi saponin semakin meningkat seiring dengan umur tanaman bawang merah, baik yang dibudidayakan di lahan marginal pasir pantai maupun di lahan sawah biasa. Saponin yang diekstraksi dari akar bawang merah yang dibudidayakan di lahan marginal dan lahan biasa menunjukkan aktivitas antimikroba yang lebih tinggi daripada aktivitas antijamurnya.

Study On Spectral Characters-Chlorophyll Inversion Model of Sabina Vulgaris in Mu Us Sandy Land

Sabina vulgaris is a group tree species in Mu Us Sandy Land. Understanding the growth status of Sabina vulgaris has guiding value for vegetation change monitoring. Chlorophyll is an important indicator to characterize the growth status of plants, and its content changes are important for analyzing the physiological growth status of plants and guiding the precise planting of plants. In this paper, the spectral reflectance and chlorophyll content of Sabina vulgaris were measured by SVC HR-1024 portable ground feature spectrometer and SPAD502 chlorophyll instrument, and the relationship between ground feature spectral characteristics and chlorophyll content of Sabina vulgaris was studied. The results show that there is a correlation between the vegetation index and chlorophyll, the effect of NDVI is the best, the bands with the highest correlation are the combined bands of 470nm-500nm, 610nm-680nm, and 740nm-840nm, and the wavelengths with the highest correlation are (660,790); Vegetation index, red-edge parameters, and chlorophyll have a certain correlation. The fitting effect of the model established by vegetation index is better than that established by red-edge parameters, and the highest R2 is 0.97; Among the three modeling methods, the model fitting effect of partial least squares is the best, R2 is > 0.91, and the disadvantage is that the processing process is complex; The processing method of the univariate linear regression model is the simplest, but the disadvantage is that the accuracy of the model is unstable, R2 is between 0.1-0.9, so the multivariate linear regression model is the most suitable of the three methods(R2>0.8).

Perilaku Komunikasi Petani Cabai Merah di Lahan Pasir Pantai Kecamatan Panjatan, Kabupaten Kulon Progo

<em><span>Communication behavior shows the initiative of individuals or communities in adopting related innovations in seeking or disseminating information.This study aims to analyze: (1) attitudes, (2) subjective norms, (3) intentions, (4) communication behavior of farmers regarding the adoption of red chili cultivation in coastal sandy land, (5) the influence of attitudes on intentions, (6) the effect of subjective norm on intention, (7) influence of attitude on communication behavior, (8) influence of farmer's subjective norm on communication behavior, (9) influence of intention on communication behavior, (10) influence of attitude on communication behavior through intention, (11) influence of norm farmer's subjective perception of communication behavior through farmer's intention to adopt red chili in coastal sandy land. The basic research method is quantitative with survey techniques. The research locations were deliberately determined to include: Bugel Village, Pleret Village and Garongan Village, Panjatan District. Sampling using proportional random sampling technique consisted of 100 farmer respondents. Data analysis used path test (path analysis) with SPSS Statistics 22.0 program. The results showed that: (1) attitudes were included in the confident category, (2) subjective norms were included in the caring category, (3) intentions had a high category regarding communication behavior (4) communication behavior had a low category, (5) attitudes had no effect on communication behavior. intention, (6) farmer's subjective norm has no effect on intention, (7) farmer's attitude has no effect on communication behavior, (8) farmer's subjective norm has no effect on communication behavior, (9) farmer's intention has no effect on communication behavior, (10) farmer's attitude has no effect on communication behavior through farmers' intentions, (11) Farmers' subjective norms affect communication behavior through farmers' intentions to adopt red chilies on coastal sandy fields. The suggestion proposed is that there is a need to increase the intensity of gathering in farmer group activities and frequent discussion forums among red chili farmers in coastal sandy areas</span></em><span>.</span>