The Carrying Capacity Analysis of Rice Plants Agriculture to Fulfill Food Needs in Pati Regency

The fulfillment of food needs is one indicator of community welfare. The calculation of the carrying capacity of food crops is used to determine the extent to which an area meets its food needs. The aims of this study were: (1) to calculate the level of carrying capacity of rice plants in Pati Regency, (2) to plan land that has the opportunity to be used as a LP2B area, and (3) to find out the maximum population and year in Pati Regency to meet food needs. The technique of analyzing the carrying capacity of rice plants uses the calculation of the carrying capacity of natural resources and the analysis of determining land that has the potential to become sustainable food cropland using an overlay map analysis with ArcGIS. The results showed that the value of the rice plant commodity had a carrying capacity value of more than 1, which was 1,371. The results of the map-making, the land that has the opportunity to be used as permanent rice fields is 50.635 hectares. The maximum population that can be met by annual rice production is 1.622.356 people. The results of population projections using the geometric method, the maximum year Pati Regency can be self-sufficient in food is 2040. The fulfillment of sustainable food needs can be realized through monitoring the implementation of the LP2B program so that the conversion rate of agricultural land can be minimized.

Efforts to suppress the rate of conversion of paddy fields and maintain sustainable food availability, the government made a policy of Law no. RI. 41 of 2009 concerning the Protection of Sustainable Food Agricultural Land (abbreviated LP2B). In addition to Law no. 26 of 2007 concerning Spatial Planning also explains the importance of allocating land for food agriculture on an ongoing basis. Protection of agricultural land is inseparable from agrarian reform (Arnawan & Surata, 2019). The law is one of the efforts to overcome the problems of degradation, conversion, and fragmentation of agricultural land due to an increase in population, economic development, and industrialization that have the potential to threaten food security, independence, and sovereignty (Prasada & Priyanto, 2019).
In addition, the policy also aims to regulate the existence of agricultural land so that it remains stable, does not narrow, and is not easily or quickly damaged due to human use (Ikhwanto, 2019). The problem that arises is that no policy provides information related to (operational) methods to support the establishment and determination of LP2B (Pridasari & Muta'ali, 2018). Another problem that also arises is the inaccuracy of planning and determining which is in the wrong corridor because some districts place LP2B in the RTRW, whereas LP2B and LCP2B or Sustainable Food Agricultural Reserves (LCP2B). must be in the Detailed Spatial Plan (RDTR) .
The policy for the protection of sustainable food agricultural land is carried out by the state as an effort to guarantee the right to food as a human right of every citizen and in the context of realizing selfreliance, resilience, and food sovereignty as well as the welfare of farmers (Pitaloka, 2020). The implementation of LP2B in the Pati Regency is also expected to maintain the existence of agricultural land and food crop production, especially in rice fields. The vigilance of the Pati Regency Government is strengthened through the Pati Regency Regional Regulation Number 5 of 2011 concerning the Pati Regency Spatial Plan for 2010-2030. Furthermore, a plan for the establishment of LP2B in Pati Regency is needed while still paying attention to development by providing space for the development of other sectors.
A study related to the balance of resource-based agricultural land and population is important to be able to predict food availability for the population. Guaranteed food needs as an indicator of community welfare. Analysis of agricultural carrying capacity in the Pati Regency is used to determine current and future food demand scenarios (Sriutomo & Christanto, 2015). Several studies have discussed the issue of the carrying capacity of agriculture and focused on the problem of the ability of agricultural land or the production of crops. In this study, the researchers tried to combine the two variables so that sustainable results can be obtained.
In this study, the researchers tried to conduct a similar study in Pati Regency. This study aims to determine the extent to which the Pati Regency can be self-sufficient in food through the calculation of food crop production and land determination for LP2B. so that the objectives of this study are (1) to calculate the level of carrying capacity of rice plants in Pati Regency, (2) to plan land that has the opportunity to be used as a LP2B area, and (3) to find out the maximum population and year in Pati Regency to meet food needs.

Methods
The research was conducted in Pati Regency ( Figure 1) using a quantitative approach, data collection techniques using the method of observation, and documentation related to the research ( Figure 2). Observation techniques are used to find out how the agricultural conditions in Pati Regency are and documentation is used to collect the data needed for research. a. The calculation of the carrying capacity of rice plants agriculture using Eq. 1 (Odum, 1967 Where KL is land requirement (Ha), LP is minimum harvest area required (Ha), Pd is total population, and Ni is commodity selling value i.
c. The criteria for determining land that has the opportunity to be used as sustainable food agricultural land refers to Subroto & Susetyo (2016). Determination of land for LP2B is done by selecting paddy fields through spatial data using ArcGIS. Then the determination of rice fields according to the LP2B criteria is carried out. The criteria used to determine LP2B are as follows: (1) Conformity with the Pati Regency Spatial Planning Map; (2) It is a wetland agricultural land, both irrigated and rainfed rice fields; (3) Land located on a stretch of rice fields with an area of > 5 hectares; (4) Have basic infrastructure such as irrigation system and road access; and (5) The suitability of the type of soil suitable for agriculture. d. Prediction of maximum population self-sufficiency in food (Sriutomo & Christanto, 2015) at Eq. 4 and Eq. 5. Pr_Ricefield = (Ls/Lu) x Pi (4) Where Pr_ ricefield : Production produced by perpetual rice field plan, Ls is eternal rice field area, Lu is the current area of rice fields, and Pi is current commodity production.
Where Pd_m is maximum population, Pr_Ricefield is production produced by the perpetual paddy field plan, and Ni is commodity selling value i.
e. Calculation of the geometric population projection for the maximum year of food self-sufficiency referring to (Eq. 6) Pn = Po.(1+r)n (6) r = 1/n.Ln(Po/Pn) Where Pn is population in year n, Po is population base year, n is number of year intervals, and r is population growth rate.

Results and Discussion
The problem of food and its sufficiency is a national problem and a global problem as stated in SDG's goal 2, namely eliminating hunger, achieving food security and good nutrition, through the achievement of sustainable agriculture. The targets listed in the SDGs are unresolved targets in the MGDs which only increase income and end poverty and hunger (Erwandari, 2017). In this study, the results of the analysis were obtained as follows.

Value of Carrying Capacity of Food Crops
The carrying capacity analysis is carried out with the availability-needs approach which is used to show an area can be self-sufficient or not (Kunu, 2020). Overall, the carrying capacity of rice plants is 1.371 (Table 1). This carrying capacity value shows that Pati Regency can still meet the food needs of its population. The carrying capacity of high rice plants in Pati Regency is distributed in 6 subdistricts: Pucakwangi, Jakenan, Sukolilo, Jaken, Winong, and Gabus. The six sub-districts have the Map carrying capacity of rice crops more than 2, in the high carrying capacity classification. Indicates having agricultural land and production of rice commodities that can meet regional food needs, and are sold to other regions. The value of high carrying capacity is built by the optimal planting area and harvested area. The existence of the Juwana River which crosses three sub-districts, namely Jakenan, Gabus, and Kayen makes the area fertile. The carrying capacity of the rice crop on a district scale is still fulfilled, but only a few subdistricts can meet the food needs of the population. The uneven distribution of the population is one of the causes of the carrying value that is exceeded in some sub-districts and not exceeded in some other sub-districts. The more people in an area, the higher the need for food. There are 13 sub-districts with a carrying capacity value > 1 and there are 8 sub-districts with a carrying capacity value < 1 (Table 2). Spatially the difference in the carrying capacity of each sub-district in Pati Regency cannot be separated from the geographical influence of a region (Figure 3). Differences in soil type, slope, rainfall, temperature, and water network affect rice production and population activities. Most of the subdistricts located on the coast have low carrying capacity because the population is mostly engaged in fish cultivation and salt farming. In highland areas, such as Gembong District and Tlogowungu District, the land is mostly used for the cultivation of fruit crops and biopharmaceuticals. Planting for food crops is not too extensive and not all types of food crops are suitable for cultivation in highland areas.

Figure 3. Classification map of commodity carrying capacity rice plants in Pati Regency
Food availability cannot be separated from the existence of land in producing food (Abrori & Priyana, 2021). The conversion of agricultural land has a wide impact in various fields, so control efforts are needed to control the rate of conversion of agricultural land to non-agricultural uses (Andriawan et. al, 2020). The calculation of the minimum harvested area of rice per year is 76,653.28 hectares. Until now, Pati Regency requires a minimum of 38,326.64 hectares of agricultural land in order to be selfsufficient in rice food crops. Calculation of the minimum need for paddy fields is used to determine areas that have the potential to be used as sustainable food agricultural land (LP2B). Determining potential LP2B areas is based on consideration and suitability of criteria. Considerations are made by calculating the minimum land requirements needed. This determination aims as a reference in determining the area of LP2B land. The LP2B land area must be wider than the minimum required paddy field area of 38,326.64 hectares.

Mapping of Land that is Likely to Be Used as LP2B
Land or land has a close relationship in agricultural activities (Jocom, 2017). The negative impact caused by land conversion is a decrease in production which can interfere with achieving selfsufficiency (Wiyanti & Purnomo, 2018). With the LP2B policy, it is hoped that each region can meet food needs through agricultural land owned by the region. Thus, agricultural land as a natural resource needs to be maintained in development activities (Sadali, 2018). Making a map of the area plan ( Figure  4) that has the opportunity to be used as perennial rice fields in Pati Regency is an area of 50,635 hectares consisting of 49,101 hectares of LP2B and 1,534 hectares of Sustainable Food Agricultural Reserves (LCP2B). In addition to LP2B, it is also necessary to determine LCP2B as potential land for LP2B in the future (Muryono, 2016). Determination of the area of land that has the opportunity to become permanent rice fields is based on the assumption that the land is a stretch of rice fields of at least 5 hectares, in accordance with the regional spatial plan (RTRW) of Pati Regency, which has basic infrastructure such as a network of roads and rivers, as well as the suitability of soil types for agriculture. The agglomeration element is an additional consideration in determining LP2B. The consideration is based on the fact that the agglomeration makes it easier to monitor and supervise the implementation as well as the facilities needed to protect LP2B.
The administrative areas of the sub-district that have extensive agricultural land to support LP2B in Pati Regency are the sub-districts: Sukolilo (6,603 Ha), Kayen (4,491 Ha), and Winong (4,868 Ha). Control of land change needs to be done to maintain the existence of agricultural land so that the food needs of the community can still be met from the area (Ragil, 2017). The sub-districts that have not been able to meet the needs of LP2B in Pati Regency are: Juwana, Pati, Gembong District, Tlogowungu District, Trangkil District, Margoyoso District, Gunungwungkal, Cluwak, Tayu, and Dukuhseti (Table  3). The results of calculations that apply the formula from Sriutomo and Christanto (2015), as stated in column 6, show that the overall results of LP2B covering an area of 50.635 hectares can meet the food land needs of the Pati Regency population of 38.326,64 hectares. Several sub-districts that have a deficit LP2B area include the following sub-districts: Juwana, Pati, Gembong, Tlogowungu, Trangkil, Margoyoso, Gunungwungkal, Cluwak, Tayu and Dukuhseti. Based on the RTRW and other LP2B criteria, the area is not good enough to be designated for LP2B.

Number of Population and Maximum Year of Food Self-Sufficiency
Regional development planning cannot be separated from studies related to population. The existence of population information will make development plans more accurate and on target (Huda et al, 2017). An area that has a good carrying capacity is an area that can provide and ensure the sustainability of food supply for its population and can carry out food self-sufficiency (Pratama et.al, 2021). The consumption needs of the people must be fulfilled to avoid the occurrence of turmoil in society. It is necessary to do a plan to prepare for future community needs by analyzing needs and predicting future community needs (Rohman & Maharani, 2017). Based on the results of calculations that have been carried out, the maximum population that can be met by perennial rice production in Pati Regency is 1,645,016 people. This amount is used as a reference for calculating population projections in Pati Regency. The calculation uses the geometric population projection method (geometric growth rate). The calculation results show that the population in Pati Regency in 2040 is 1,609,968 people. The projection calculation can be seen in the Table 4. The results of the maximum population projection for food self-sufficiency in Pati Regency are still considering if at any time there is a population explosion. Population growth in the last 10 years (2010-2020) reached 1.03 percent. Population growth has increased quite drastically from the previous 10 years ( [2000][2001][2002][2003][2004][2005][2006][2007][2008][2009][2010] which was only 0.37 percent. The population explosion has made the demand for rice plants higher because the population is increasing. In addition, the decline in production and landuse change is also one aspect that poses a threat to food availability in Pati Regency. The results of the calculations carried out have the opportunity to cause the prediction year to go forward or backward. Land management to maintain its fertility needs to be considered so that productivity does not decrease and affect rice production. The participation of related parties is needed to maximize agricultural potential as an effort to maintain food availability in Pati Regency.
The results of this study are relevant to previous studies that the value of carrying capacity of food crops is influenced by the amount of food crop production and population. Land area also affects the production of food crops produced. Therefore, to realize the condition of food self-sufficiency, the condition of agricultural land in an area also needs to be considered. The increase in population needs to be controlled so that there is no population explosion that will have an impact on food availability in an area.

Conclusion
The value of the carrying capacity of rice crops in Pati Regency is 1.371 which indicates the fulfillment of rice plants in Pati Regency. The results of the LP2B map show that the potential LP2B land in Pati Regency is 50,635 hectares. The LP2B map-making is based on several assumptions such as a stretch of rice fields with an area of > 5 hectares; having basic infrastructures such as access roads and river networks; conformity with the Pati Regency RTRW map; and has the type of soil suitable for agriculture. The agglomeration element provides additional consideration in monitoring the LP2B program. The maximum population that can be met for food needs is 1,622,356 people. Pati Regency can meet the food needs of the population until 2040 or the next 20 years with a population of 1,609,968 people.

Conflicts of Interest
The authors declare no conflict of interest.